#video on #3D-printing pneumatic logic display #mechanisms (incorrectly described as #fluidics) with FDM and silicone membrane to get 8×8 bistable pixels, which he can play Snake on. Each pixel has a single pneumatic vacuum valve (“transistor”) which permits vacuum to the display only when there is vacuum on both the column channel (providing the air current) and the row channel (opening the valve). To get airtight channels with FDM he prints slow, hot, and overextruded, which still wouldn’t give you the wall smoothness you need for fluidics. The multiplexing is rather slow because he’s driving the rather voluminous channels with solenoid-driven valves, getting speeds more like 8Hz than the 10kHz or so normally achieved with fluidics. The platinum-cured 25A silicone membrane’s smooth surface comes from the air-exposed surface of the silicone in a mold carefully leveled with a 2-dimensional bubble level; he tried using a different, commercially-made silicone membrane for the logic surface, but it had to be smooth and flat on both sides, and the commercial silicone sheet wasn’t smooth enough, so he cast his own with glass as the mold on the bottom side. To get the warped bottom surface of the 3-D print to be flat enough to seal well, he sealed it against glass in a vacuum bag and then annealed the assembly at 60° for several hours. Tiny raised concentric rings around the holes that have to make contact with the silicone membrane hopefully make the system more robust against small deviations from flatness. He 3-D prints Luer lock adapters for standard medical tubing, which connect to the logic board with O-rings. I feel like you could probably Charlieplex with this pneumatic-logic approach, and with silicone you might even get a reasonable lifespan, especially with less extreme flexions than the ones he demonstrates in the video. Amusing note: to speed up display updates, he seems to activate multiple rows simultaneously when their contents are identical, an approach which might work for other kinds of multiplexed #displays.
on 02026-08-24#video by #Harrison-Low on his jugglebot triumph. He finally switched from kevlar kite string to #UHMWPE for the linear actuators. Also he switched to #ODrive Pro electronics to control the motors. Featuring a #JLCPCB #3D-printing ad, sigh. Oh, also he burned out the hand motor because a sensor cable came unplugged. #robotics
on 02026-08-18#Concept-Crafted-Creations #video about #manufacturing the #solar-energy collector based on the James Webb Space Telescope with 18 mirrors costing US$5 each. Explains that the JWST uses gold so it can do better infrared imaging. He made some small concentrating mirrors by letting heated plexiglas discs sag into a mold made with #3D-printing, which seems like an interesting technique for #optics in its own right, though possibly not imaging optics. Rather than for the final solar concentrator, this was used for a goofy invalid experiment to compare “silver” and “gold” which were represented by colored spray paint, and the “#energy” gathered was measured by some unknown kind of light sensor #electronics. For his big collector, he used not just 3-D printing but also #laser-cutting on wood and assembly with screws. He also used a laser-cut alt-azimuth wood base with a giant gear for #solar tracking. He explains the three-point screw-and-compression-spring mounting that makes each of the 18 mirrors alignable, using TPU accordions for the compression springs; the mirrors themselves are laser-cut plexiglas with reflective window film stuck to it. He was hoping to sag these plexiglas hexagons into a mold in the same way as for the small test mirrors, but his microwave oven (which must be what he used for the others) damaged the window film, so he ended up heating them to only 100° or 120° and clamping them into a mold (with a laser-cut custom clamp) instead of just letting them sag under their own weight. His aluminum collector plate with coolant grooves running through it cost him US$171 for #PCBWay to custom-machine, making this a very expensive solar collector, though he thinks it’s cheap. Also he’s in the Netherlands, where it’s cloudy a lot, especially in winter. Comments mention that blackening copper with liver of sulfur makes a good solar-collector material.
on 02026-08-15Doba is apparently another #dropshipping #3D-printing site? What value do Doba’s “retail” customers add?
on 02026-06-15apparently Faire is a #dropshipping site where you can like dropship #3D-printing products? I’m a little bit unclear on whether you can upload your own STLs and have them print them for your customers. If not, what value do Faire’s “retail” customers add?
on 02026-06-15PrusaSlicer dropped the use of #Perl a couple years ago. #3D-printing
on 02026-05-26"Preflight3D" is a new AGPLv3 C++ slicer for #3D-printing
on 02026-05-26a #jugaad macro photography lens made by #3D-printing an adaptor for a (US?)$20 4× microscope objective lens to take pictures of aphids and other tiny insects on leaves using focus stacking. #photography
on 02026-04-14#manufacturing an improved (?) cyclone separator for removing dust from air with #3D-printing. Reports that the clear PVC he used for his outer air duct is much nicer to work with (with a table saw) than other clear plastics. He has a filter bag following these separators in case they don’t catch everything. 95+% of the dust gets caught by the separators. His filter bag has a clear flexible window sewn into it so you can see it fill up! #video #mechanisms
on 02026-04-11Spectrum PET-G FR V0 flame-resistant #3D-printing filament for US$60/kg. “The filament is designed according to UL 94 V0* flammability rating requirements, meaning that the vertical burning of the filament or printed part does not exceed 10 seconds.”
on 02026-04-09files for #3D-printing another nice-looking #Wago junction box
on 02026-04-09files for #3D-printing a nice-looking #Wago junction box
on 02026-04-09#video #toread on #3D-printing variable-pitch rotors for #flying a large, high-efficiency quadcopter. #manufacturing #drones
on 02026-04-07#Engineering-Knits #video on #3D-printing a circular sock machine (CSM) for automated #knitting. #fiber-arts #toread
on 02026-01-03Maxim #Kachurovskiy on #manufacturing a concrete lathe for #machining with #3D-printing the molds, part 2. #video #toread
on 02025-12-18Maxim #Kachurovskiy on #manufacturing a concrete lathe for #machining with #3D-printing the molds, part 1. #video #toread
on 02025-12-18#video of Riley Kolbow’s #worksbydesign chess pawn #mechanisms that transform into each piece, such as a queen. #3D-printing in stainless or plastic.
on 02025-12-16#video on #bootstrapping “#Precision on a Budget” for a US$10 micron-resolution displacement sensor. Specifically he’s using the 8-blade linear-movement flexure Gelbart taught, but made it out of plastic with #3D-printing, with a knife edge in the beam path of an optointerruptor, which he superglued into it once he found the linear region of the optointerruptor. A steel BB on the other end of the linear-motion stage serves as his “stylus” for feeling a shaft or whatever he wants to measure the displacement of. Then he calibrates it with grade-0 (±150nm) gauge blocks from Mitutoyo. He estimates his error at ±5μm over a range of 700μm.
on 02025-12-09#SIGCHI #paper #toread about #3D-printing volumetric shapes by #knitting
on 02025-11-25#CNC-Kitchen #video on orienting parts for #3D-printing to get better strength; in his initial test his dogbones broke at 63MPa in the in-plane direction but only 31MPa in the cross-plane direction due to lower layer adhesion, a factor of 2 he says is typical. Perhaps unsurprisingly, dogbones printed at 30°, 45°, and 60° from the horizontal were intermediate in strength. Demonstrates “shrink lines” on Benchy and discusses tricks for supports. In his example vacuum-cleaner adapter, he claims that the non-alignment of the layer lines with the stress concentration point from his vacuum cleaner adds additional strength.
on 02025-11-21#Sanladerer #video on why #3D-printing still uses stepper #motors #toread
on 02025-11-11#video #toread on "Selectramatronics", using a Selectric-like mechanism for mouth expressions on face #automata made by #3D-printing
on 02025-10-29Maxim #Kachurovskiy’s #video of #manufacturing a concrete lathe "NanoEls" with #3D-printing for #machining. Except that he also bought some machined aluminum parts from #JLCPCB CNC. Includes open-source (?) G-code control thing that consumes STL files. He regrets not leaving two channels in the base to post-tension the concrete with M12 threaded rod and not vibrating the concrete enough to get the bubbles out.
on 02025-10-21#Hyperspace-Pirate #video on #bootstrapping/#manufacturing a #DIY #jugaad CT-scan #tomography #radiography machine (using a donated dental #X-ray machine and an “intensifier screen”) and #3D-printing the results. He triggers his phone’s camera app with a spring-loaded pin controlled by an Arduino-triggered relay. Lowest power setting is 60kV, 4mA. He hacks the images with the GIMP to get reasonable grayscale, then feeds them into the open-source “3D Slicer” to try to do computed tomography, but it didn’t actually do tomography, just meshing once you’ve already done the tomography, so he used a “cone-beam backprojection tool by Stanislav Maslan” for that. The result is pretty noisy but he can 3-D print it. He scans a frozen dead rat, a star-shaped squash, a frozen sardine, and a large fish head.
on 02025-10-20#video by #Giestas on #manufacturing a cup from used coffee grounds by binding them with agar and honey, melted in a double boiler before stirring in the grounds, then pressing the soft mass into a three-part mold made with #3D-printing, about 1cm thick. It suffers cracking damage from wetting/drying cycles. Oil of wintergreen to prevent mold, and he makes a planting pot. Relative quantities of honey, agar, oil of wintergreen, and coffee grounds are not disclosed. #materials
on 02025-10-18#Segerman #video about single-degree-of-freedom deployable #mechanisms that fold up into an icosahedron, made with SLS #3D-printing from nylon
on 02025-10-18#3D-printing #mechanisms video: an iris, a print-in-place articulated gingerbread man, a magnetic fidget sword, a fidget clicky gear with a spring, two interpenetrating helical halves of a pyramid, a print-in-place planetary herringbone gear fidget spinner, and some kind of silly Oreo thing
on 02025-10-17#video #toread on using stepper #motors instead of #brushless motors for #3D-printing
on 02025-10-16#video #toread on adding gears to #bicycles with #3D-printing #mechanisms. The script seems to be AI #slop. The single-speed drivetrain design seems to be a useless gimmick with no technical advantage, and it adds a lot of weight to the bike, but the fabrication technique advice seems solid.
on 02025-10-16#video by #Malawey on #manufacturing with #8020 and similar aluminum T-nut extrusions. He prefers the Automation Direct brand. 30×30mm has pricing of US$15/meter (M6 fasteners ideal, or M8 for the end holes, 9mm groove depth), 20×20 US$8/m (M5 fasteners ideal, or M6 for the end holes, 7mm groove depth), 35mm DIN rail US$5.20. He cuts them with wood-cutting blades on wood saws, although his "wood blade" looks like it has a brazed-on insert on each tooth, presumably tungsten carbide, and it appears to say “CARBIDE TEETH / DIENTES DE CARBURO / DENTS DE CARBURE”, so it could probably cut concrete. He recommends putting some wax on the blade to make a cleaner cut, by cutting a bar of wax together with the aluminum. He reports that it is also possible to get a clean cut on cut magnesium #materials with a saw this way. He warns that “V-groove” extrusions are needed for rolling V-groove wheels on. Sometimes your screws contact the bottoms of the grooves because they’re too long, which can be remedied with a thick washer. For wheels he recommends #3D-printing a bracket to hold a rollerblade wheel. He spends several minutes demonstrting how to use SolidWorks to design such things by pretending they’re weldments.
on 02025-09-29#Clough42 #video on #precision #manufacturing via #3D-printing, specifically, his filled ABS system (“eSUN ABS+”) shrank by about one part in 300, which ended up being half a millimeter in a 151-mm screw hole spacing part. He measures the hole distance with gauge pins and digital calipers by averaging the outside-of-pins distance with the inside-of-pins distance. “Typical ABS has over 0.8% shrinkage rate. ABS+ is less than 0.4%,” but actually he measured about 0.58% (5800ppm, or about 73ppm/°, assuming the part is at 100° while printing). His proprietary slicer Simplify3D has an option in Tools→Options→Models→Import actions→Scale All to do this automatically.
on 02025-09-29#video on Travis Mitchell’s #DIY metal #3D-printing with fiber laser SLM in an argon-filled chamber, which I guess he’s cutting out of steel sheet with a CNC laser cutter, which he says makes much cleaner cuts (less slag on the back of the sheet) when he uses oxygen as an assist gas. Seems to be using #8020 style aluminum extrusions for the frame. He’s going to try to print in 15–45μm 316L Würth stainless steel powder, and in this video he runs some powder-spreading tests with his crooked coater blade, but he’s not ready to actually laser the stuff yet. #toread
on 02025-09-29#video of #Evan-and-Katelyn #manufacturing #concrete keycaps for a custom keyboard with PVA glue replacing some of the water in the cement (like a quarter or half or something), using personal vibrators to get the mix down into the keycap molds where they’re overmolding keycap stems made with #3D-printing. Also they tried adding 3% chopped fiberglass to their concrete mix, which is totally going to fail. They also tried adding more sand. To suppress bubbles, they loaded the keycaps into a pressure pot to cure. The fiberglass concrete wasn’t sandable, breaking apart. The PVA concrete felt “super hard and dense”. They also made the outside of the case out of concrete. It weighs three pounds, and the wrist rest another 1.7.
on 02025-09-28#video by #Makers-Muse about #3D-printing floppy elastomer filament #materials that aren’t TPU, like PEBA, polyether block amide (?) which apparently you have to print at about 250° to get good layer adhesion. Also, foaming TPU, glass-filled polybutylene terephthalate (PBT-GF), and regular polypropylene, for which you need to coat your bed with polypropylene packing tape or something to get it to stick. Also a TPU/nylon mix and PVA as a water-soluble elastomer. #manufacturing
on 02025-09-28#Xyla-Foxlin #video on #3D-printing a rocket out of some kind of carbon-fiber-filled filament and #flying it. On her third attempt she broke the sound barrier.
on 02025-09-27#video #toread by Zack Freedman about FDM #3D-printing weird filament #materials like sinterable zirconia
on 02025-09-25Formlabs bought the Micronics #3D-printing startup “to Develop the Next Generation of Accessible #SLS”
on 02025-09-25#video about #SLS #3D-printing: apparently Formlabs bought Micronics, so their US$4000 printer may never see the light of day.
on 02025-09-25#video of #3D-printing a book of #mechanisms: planetary gears, scotch yokes, a geneva wheel, a belt drive, various linkages, etc.; “Machines in Motion” by AxelMadeIt, with about 70 3-D-printed parts. Unfortunately he added some horrible AI slop doggerel. #manufacturing
on 02025-09-23#video of #flexures for #3D-printing a sort of 50-gram plastic carabiner for a #manufacturing competition at “Maker Retreat”; it broke at 1.1 tonnes.
on 02025-09-136' #video on #Ibanis-Sorenzo’s wirenut #mechanisms made by #3D-printing: a split screw with a flexure at one end clamps down on the wire when compressed with a conical nut. He calls it a “lever screw” but there’s no levering going on.
on 02025-09-06#video #toread by #Murray-Smith about #3D-printing some sort of electric generator #mechanisms?
on 02025-09-06Vik Olliver is doing micron-scale #RepRap #3D-printing! “This degree of accuracy was initially made possible by 3D printed microscope platforms designed by The #OpenFlexure Project.”
on 02025-08-27#video on #electroplating #3D-printing in “PVB” and smoothing with isopropanol
on 02025-07-02#manufacturing #3D-printing #video by #Sanladerer on including formable ribs or ridges running the length of 3-D printed plastic holes as “self-forming threads” to allow M3 machine screws to reliably form threads in them, contrasting with other options like heat-set inserts, “prong nuts”, and inserted hex or square nuts.
on 02025-06-16#video of #bootstrapping a #CNC mill under AU$500 with a focus on rigidity and a small footprint with #3D-printing, using a non-gantry design to improve rigidity. A steel Allthread skeleton is wrapped in 3-D printed forms for the concrete, PLA with seams sealed with superglue. I don’t really understand how the threaded inserts in the concrete work; maybe the screw presses the 3-D printed plastic out against the concrete walls? He uses a vibrating sander as his vibrator for the concrete pour; after initial one-hour set, scraping with a spatula removes excess concrete. He says “non-gantry” but he’s using two sets of two parallel linear rails for the X and Y axes; it’s just that he’s moving the workpiece with anti-backlash-spring-loaded leadscrews rather than the toolhead. He’s also just using NEMA 17 steppers instead of real servos. #manufacturing
on 02025-06-16#video on #manufacturing STM or AFM piezo actuators from piezo benders by cutting them into quarters with a box-cutter blade positioned by #3D-printing a jig
on 02025-04-01another #SLS #3D-printing #video on Micronics’ product (looks like US$3700 desktop SLS of metal-filled nylon 12 (US$88/kg) or TPU, not metal), by #CNC-Kitchen. Still on Kickstarter, though. They’re using quartz-halogen bulbs to preheat their build chamber so they can use just a 5-watt blue diode laser with a 250μm spot size to “kick it over” the melting point. Too bad about the large spot size; they say their step accuracy is 5μm, and they’re using 110μm layer height. Inside the printer they have a “carbon HEPA filter” to remove dust.
on 02025-03-22another #SLS #3D-printing #video #toread
on 02025-03-22#video #toread on #bootstrapping #DIY SLS #3D-printing using Inova
on 02025-03-22#video on #3D-printing in metal with laser SLM in a #DIY rig #bootstrapping #manufacturing #toread
on 02025-03-22#video of FDM #3D-printing at 1000fps using a used mass-market Sony RX100V digital camera. Explains “shaping” algorithms to suppress vibrational modes of the printer detected with accelerometers during an initial shake. Shows die swell and filament purging smoke.
on 02025-02-03#Shake-the-Future #video of a microwaveable soldering iron with a sodium-silicate-bonded carborundum susceptor, which is wrapped in a ceramic-fiber blanket to hold it in place inside a cage made by #3D-printing a high-temperature resin. The blanket is in turn held in place with green (!) Kapton tape. 30 seconds in his household microwave heated the 10 grams of carborundum to a nice electronics soldering temperature. He soaks the exposed edge of the blanket with boric acid with the idea that this will keep it from fraying and producing irritating dust.
on 02025-02-03#video on #Hyperspace-Pirate #bootstrapping DIY #CNC upgrades. He drilled the aluminum parts (on his drill press, I assume) with locator jigs made with #3D-printing; that’s almost 3-D printing of aluminum, right? Two nuts on every leadscrew, separated by a nut block, can be preloaded (with four screws in each nut) to reduce leadscrew backlash. His gantry machine frame is largely #8020 rail held together with 3-D printed PLA brackets. He says FreeCAD is very intuitive and easy to use.
on 02024-12-27#video #forgreg on #solar #photovoltaic sun tracker using his design (but three years earlier) using #3D-printing
on 02024-11-27#3D-printing files for #King-Arthur #sculpture called "Gallos"
on 02024-11-27#video by #Titans-of-CNC on #3D-printing with #binder-jetting, profiling a job-shop company in Ann Arbor named Azoth Digital Metal (Azoth being the alchemical universal solvent). The Markforged “PX-1 odger” (?) printer they like most can do up to 90kg in a single run, using 70400 nozzles each depositing 2.1 picoliters of binder at 15.5kHz, using air bearings and linear motors, as explained by Markforged’s bizdev manager for metal binder jetting, Ross Adams. Markforged’s technical director Hans Kimblad was also for some reason onsite, and also their president and CEO, Shai Terem. They’re printing small parts like firearm mag[azine?] releases, saying it’s much cheaper than machining but more expensive than metal injection molding. They’re also 3-D printing seatbelt parts that then get chrome-plated. They say they can hold tolerances of “plus or minus about three thou” on small features, ±75μm, “five thou would be typical”, and presumably even worse for large features: “I give people a 1% rule,” so a 400mm dimension would be ±4mm! “It’s a small complex metal part technology. So really I’m focused on parts 120mm in the longest direction, or smaller.”
on 02024-11-26#video #toread by #StuffMadeHere on new FormLabs SLA #3D-printing machine
on 02024-11-14people report some success smoothing PLA prints from #3D-printing with ethyl acetate, but nophead says it won’t dissolve them
on 02024-11-14#Marco-Reps #video on #precision #metrology for evaluating his open-source ADR1000 voltage standards. He ends up #3D-printing #flexures out of ASA for its low creep to preload copper-on-copper rotary-switch contacts to try to keep oxidation down. His stator contacts are bare copper on an aluminum PCB. #electronics #hardware
on 02024-11-12#3D-printing pioneer "Sanjay Mortimer" died at 32 of “either an accidental overdose or #suicide”.
on 02024-11-12#video of brick-like layers for #3D-printing stronger parts with FDM, as later popularized by others
on 02024-11-11#3D-printing an enclosure for human respirator filters from 3M to safely absorb fumes from your 3-D printer.
on 02024-10-25#video on #3D-printing forms you fill with concrete for #bootstrapping #machining tools like a lathe
on 02024-10-22#video with too much talking head about polar #3D-printing
on 02024-10-18#video about #manufacturing #aluminum-air #batteries with #3D-printing ABS. He says potassium hydroxide will eat PLA, which makes sense but which I hadn’t realized. #Mr-Electron here is using steel baling wire for his cathodes. For his anode he cuts up thick aluminum sheet metal with shears and then presses it flat in a vise. Each aluminum anode plate is crimped onto baling wire from the following cell in the battery using a hammer and anvil. He gets 10.2V open-circuit voltage from 8 series cells. I’m unclear how air is supposed to get to his cathodes. He does some load testing with small electric motors but doesn’t actually measure the current. The short-circuit current he measures is 160mA and rapidly dropping. After testing with LEDs for a while the open-circuit voltage has dropped to 3.8 volts. Later he cuts cathode forms out of CDs with an angle grinder and cutoff disc, wrapping them tightly with baling wire to maximize area. His higher-current anodes are aluminum-foil-wrapped popsicle sticks, dimensioned to fit inside the battery compartments, but for whatever reason he didn’t install the plates parallel, resulting in a dramatically unnecessarily high internal battery resistance, which he doesn’t bother to measure, but he gets 240mA out of it. His connections to the aluminum plates are made by torquing a pringled steel washer down onto their non-submerged ends with a bolt. The 6 cells in series ought to give about 9.6 volts open-circuit, but instead he gets only 4.8V (0.8V per cell), which he blames on residual sulfuric acid contamination, but commenter “gsestream” suggests might be due to a lack of oxygen. He uses a DFRobot USB boost converter to charge his cellphone. #bootstrapping #scouting #jugaad
on 02024-10-18#video about #3D-printing #flexures #mechanisms with mostly the same standard flexures popularized by BYU that everyone shows.
on 02024-10-02#video on #3D-printing an #STM for #microscopy. This is a unimorph disc type made from a piezo buzzer; he ruined several before switching to ultra-fine magnet wires and low-temperature solder (ChipQuik?). His kinematic mount seems to consist of three bearing balls, one in a V-groove, one on a flat glass surface, and one in some kind of a pit, each adjustable with a knurled screw. He seems to have used heat-set inserts to build his frame out of 3-D printed plastic — although PLA has the best TCE of common plastics, he’s using PA-CF, carbon fiber reinforced nylon, which ought to be pretty stable in the X and Y dimensions, like wood. (He mentions that many STMs are made out of Zerodur or similar glass-ceramic #materials.) Printed on a Bambu Lab X1 Carbon. The voiceover might be an AI reading a script because it mispronounces a lot of words and sometimes gets the prosody of sentences wrong, despite having a bog-standard GA accent. He put metal tape on the parts for EMI shielding; looks like aluminum flashing. To pre-amplify the nanoamps or picoamps signal from the tunneling current, he copied Dan Berard’s open-source STM preamp circuit, naturally using a current-to-voltage converter built around an op-amp, but I can’t tell which one. He shielded his cable to the probe and put the analog electronics in a Faraday cage to reduce EMI further, getting only about 10pA of noise. Berard’s #electronics design used an OPA124, but he says “The chips used in Dan’s design are hard to find these days.” When it comes to #microcontrollers #hardware, he’s using a Teensy 4.1. He’s using an aluminum plate and some rare-earth magnets to damp the oscillations of his stable platform. “This is the first atomic image captured by a 3-D printed scanning tunneling microscope.”
on 02024-09-28#video on #bootstrapping a DIY #CNC #machining mill under US$100 by #Hyperspace-Pirate, somehow including multiple-start leadscrews, brass nuts for them, etc. He’s #3D-printing the brackets to hold the aluminum together. Basically a bunch of aluminum extrusions (largely 8020 style held onto the brackets with T-nuts) to make a bedslinger gantry, which he can now mill aluminum on. The slinging is all happening with leadscrews instead of timing belts. He’s using NEMA steppers with shaft couplers, lots of Allen screws, precision-ground rods with linear ball bearings running on them, etc. Not super practical for poor people! The simple rectangular design maximizes compliance, which is counterproductive. And it’s going to lose steps and ruin parts from the end effector side loading. “I’m using a 24V 20A power supply which is way beyond what the machine needs but it’s what I had sitting around.” He’s running GRBL on an Arduino Uno, with A4988 breakout boards on an Arduino shield on top of it to drive the steppers. For whatever reason he decided to run the spindle off a 555 PWM driving an IRLZ34N MOSFET. He’s using UGS (Universal Gcode Platform) on his laptop to send the G-code to GRBL. He engraves and routes some wood with a ⅛” endmill. Rigidity problems initially prevent cutting aluminum. Budget: US$30 for spindle motor and collet (1.5A), US$24 for the build plate (¼” aluminum), US$11 linear bearings, US$10 extra endmills, total US$75.
on 02024-09-24#video #toread on DIY (?) metal #3D-printing
on 02024-09-24#video #toread on DIY metal #3D-printing
on 02024-09-24#video #toread on DIY metal #3D-printing with “DED”
on 02024-09-24#video #toread on alternatives to “fuzzy skin” for #3D-printing
on 02024-09-24#video #toread by #Makers-Muse on #3D-printing without looking 3-D printed
on 02024-09-24#video #toread about #3D-printing #optics components (not lenses, prisms, and mirrors tho) #Breaking-Taps
on 02024-09-17#video somewhat poorly explained on #3D-printing #kinematic-coupling #mechanisms for #precision #optics. He shows his optical kinematic mount for a long time without showing what he’s going to use it for, instead trying to explain it in words. He has a green diode laser module mounted in a 3-D printed thingy which is pushed apart with screws (with ground and buffed ends rather than ball bearings as you’d expect) running through soldering-iron-staked brass inserts, pushing on flat stainless steel plates, pulled together with tension springs pulling on bits of welding rod, and pivoting on a 7mm stainless steel ball bearing; all the metal parts are inserted into the plastic framework. I think the idea is that you slide this thing around on a surface and the angle of the laser changes to show you the angle of the surface. The laser module is clamped into the thing with an M4 screw tightening a sort of plastic shaft-collar arrangement around it, and a Powell lens (?) turns the laser beam into a line, which I guess lets you determine the surface’s angle in both dimensions at once? He thanks “Zachary from Breaking Taps” for tips. He’s planning to focus the laser through a spatial filter with a microscope lens to clean up the dirty “cat’s-eye” beam. He’s going to put ball bearings in the base of the mount too, to hold it up (bizarrely, four of them instead of three!), and there’s a screw in the middle to hold it down to a screw hole on the optical breadboard. He's planning to replace the plastic with aluminum or stainless steel. In the comments, @bansci recommends using #OpenFlexure designs and captive nuts rather than heat-staked inserts.
on 02024-09-15#video of #3D-printing a novelty chair in 64 pieces of plastic, held together with hot-glued dowel joints (for which he 3-D printed 173 tapered dowels) reinforced with Total Boat Thixo epoxy, which pushed the pieces apart as it expanded while curing. So he reassembled it with superglue holding the pieces in place while the epoxy cured (over a week). An eloquent description in the middle of how you feel when a project has an unexpected bad turn. He used expanding spray foam to fill a gap resulting from a version control error which resulted in printing the wrong version of part of the chair; this would have badly weakened the chair. The printing took 30–50 print days spread across 4–5 calendar days. The service bureau, "Slant 3D", buys PLA beads for US$1.50 to US$2 per “pound” (US$3.30–4.40/kg) and makes their own filament from it normally; they charged US$568 for the print, though normally they would also charge for their time doing the design.
on 02024-09-13#video on designing a clip for a “threadboard” made by #3D-printing, including concerns about layer adhesion, friction, and swivel #print-in-place #mechanisms
on 02024-09-13#video on #manufacturing #kinematic-coupling #precision #mechanisms with #3D-printing by #Sonya-Vasquez. Using pairs of round metal dowels and threaded balls.
on 02024-09-10#video Overview of the current state of #3D-printing houses. Apparently the material mix requires tweaking for every job site; it’s sensitive to humidity, temperature, water temperature, “material temperature” (of the dry mix I assume), if it rains, if there’s wind, etc. As of two years ago.
on 02024-09-10#video by #Integza about a “laminar-flow rocket engine”. He uses #3D-printing from K3D in the Netherlands to print part of it it from porous metal (stainless I think) so that the fuel-oxidizer mix is injected over a large area — through a gyroid that fills most of the combustion chamber.
on 02024-09-10#Segerman #video: a “flórice,” a sort of flower of cyclide-shaped bananas (made by #3D-printing) that slide smoothly between being a sphere and being a disc, propelled by bevel gear #mechanisms. He calls it “slide-glide cyclides”.
on 02024-09-10#video #toread about #3D-printing woodworking tools #bootstrapping #manufacturing
on 02024-09-05#video #toread about #3D-printing tools #bootstrapping #manufacturing #teaching-tech
on 02024-09-05#Breaking-Taps #video about #MEMS accelerometers. He uses a lot of electron #microscopy to show the #flexures and other #mechanisms, then makes macroscopic replicas with #3D-printing. I don’t understand the whole flexure layout, but I appreciate the effort. He says the “gyros” use the Coriolis force generated from resonant vibration, which changes their resonant frequency. I don’t know. #toread
on 02024-09-05#Shake-the-Future #video on his “print-wave casting” #manufacturing technique with #3D-printing
on 02024-09-03#video #toread on #3D-printing a #wire bending machine
on 02024-09-03#video on square nuts for #3D-printing inserts #toread
on 02024-09-03#video on the hazards of #3D-printing with carbon-fiber reinforced filament #toread
on 02024-09-03#video on LCD SLA #3D-printing at costs competitive with injection molding (an ad for #Merit3D). New UV Basics Hard Black resin from Photocentric has pricing of “only” €20/kg; he says prices are 4–5× the costs of thermoplastics because thermoplastics are “already a commoditized item”. Shitty video consisting of 80% talking heads, stock footage, and even stock photos. He holds up an example molded part and says an injection mold would be US$10k to US$20k, and then each part would cost 75¢, while with his company’s machines, it’s US$2–3 per part. For smaller and more complex parts, he says the breakeven point where injection molding is cheaper is closer to 5 million parts. They’re a service bureau rather than a printer vendor. #manufacturing
on 02024-08-27#Clough42 #video of #3D-printing tool drawer organizers for micrometers, calipers, squares, and other metrology tools, using #Gridfinity. Shows #smart-tweezers in passing at 3'35". He prefers PETG or ABS for the drawer organizers because PLA is too brittle.
on 02024-08-27#video of #Helmke #3D-printing some #mechanisms out of plastic to sort and assemble parts pneumatically with a magazine-fed pneumatic parts feeder for his screws. Sucking them through with a sort of aspirator helped solve some bouncing problems he was having that gave him backwards screws. Finally he wires them together with a CAN bus. #automation #manufacturing
on 02024-08-27#Malawey #video on #precision #mechanisms with #3D-printing: “Borrow a Tolerance!” Lots of wisdom about mechanical engineering and which industrial #manufacturing processes have which drawbacks. He shows a 3-D printed collet as one example of a non-borrowed good tolerance. Demonstrates some 3-D printed springs in I guess ABS, but says you can “borrow a [precision] spring rate” from a spring-steel binder clip, which also doesn’t creep at “any temperature a human can survive”. Borrowing smoothness and toughness from HDPE tubing (from water systems) to make hinges; he sharpens it in a pencil sharpener to get it to go through his #print-in-place hinges more easily. His print-in-place approach has support material between parallel horizontal layers which must be broken free with a spatula or hammer.
on 02024-08-27#3D-printing experiments on material properties of thermoplastic elastomers such as TPU, with a Charpy hammer test and tensile strength. #video #CNC-Kitchen
on 02024-08-21#manufacturing molds for wire repair with a hot-glue gun using #3D-printing to overmold hot glue over broken cables to make a waterproof flexible repair. He uses vegetable oil as a mold release and PETG for the FDM printing. Very nice neat results.
on 02024-08-21#video of #manufacturing #woodworking tools by #3D-printing: templates for a router, an air guide for a router vacuum cleaner, a T-square with holes at 1-mm increments for drawing parallel to an edge (printing the first layer in a contrasting color), screw pattern guides for particular hinges, a drill guide for putting your Forstner bit the right distance from the edge of a plywood panel, a clamp with a rather oversized screw thread, and a scribing tool for transferring the outline of a wall onto the edge of a board you want to cut. #bootstrapping #scouting
on 02024-08-20#video on #3D-printing silicone molds #toread
on 02024-08-04#video about #3D-printing with "computed axial lithography", Taylor Waddle's doctoral research at Berkeley under Hayden Taylor (?) with Brett Kelly, using an off-the-shelf movie projector retrofitted to use 405nm LED light.
on 02024-08-04#video #toread about #3D-printing microscopic glass
on 02024-08-04#video on "quadrupolar" #3D-printing with four nozzles on radial arms over a polar bed, almost a meter in diameter. Still seems like it has a dead zone in the middle. He used mostly stepper motors and aluminum 8020 extrusions. He’s limited to making things that are fourfold symmetric by the Clipper firmware he’s using. #manufacturing
on 02024-08-01#Shake-the-Future #video of #3D-printing a split casting box, with alignment pins, with the pre-split casting form halves already in it, allows you to pour investment casting plaster (dental casting plaster without sand) onto the print bed, then withdraw the form from the plaster once it sets up. Sprues can be hollow, and I guess the form can too. He’s using PLA, which in this case you don’t actually want to spontaneously delaminate from the bed when it cools. And he’s running G-code on the printer (a Prusa MK4) to shake out the bubbles from the plaster! This also avoids the need for alignment pins in the form (just the box) and the need for parting dust. I bet you could do this with sand casting too! To help with withdrawing the form from the mold, he microwaves it in a plastic bag, which even permits undercuts, like lost-PLA casting. No plastic is left in the mold when you turn the furnace on. He uses his airfryer to dry the mold for two hours, then his oven for three more hours at 250°. And then he uses a microwave kiln to melt brass! He says it can even melt stainless! His alignment-pin holes were sized for M8 bolts, which also hold the mold shut. He uses a Noga deburring tool to remove the mold flash. He calls this technique “print-wave casting” because he uses the microwave. #manufacturing
on 02024-07-10#PDF of #PolyCast filament datasheet for #3D-printing casting molds. Doesn’t say what’s in it. 1.1g/cc, absorbs 2.09% water at 70% RH at 23° with a time constant of about a day, glass transition of 70°, decomposes at 260°, heat deflection at 52.7°–66.5°, 1745MPa±151MPa Young’s modulus, 35.7MPa tensile strength, 5.8% elongation at break, prints at 190°–220°. I wonder if you could anneal it like PLA. Supposedly it’s made of PVB, whatever that is. #materials
on 02024-07-10#video on 3-D scanning of #cuneiform tablets with a 75μm-resolution X-ray CT scanner, then #3D-printing replicas
on 02024-07-10"Objaverse" has #pasivos of 3-D meshes: 817899 3-D models with meshes and texture maps. All under #CC licenses. Some could be useful for #3D-printing.
on 02024-06-26#video about FPV drone #weaponry in #Ukraine, describing the tradeoffs of things like analog vs. digital video. Lots more #3D-printing on view here.
on 02024-06-25#video about #3D-printing a whole #flying drone, “even the motors”, using 3 kg of filament, but evidently they’re wound with regular copper wire and using steel cartridge ball bearings and steel nuts and bolts and, originally, a steel 8mm shaft and collar, which he replaced with (brass?) heat-stake inserts and a precision-ground steel shoulder bolt. The motor’s magnetic core is, however, 3D-printed using “magnetic PLA”. He’s also using (rare-earth?) permanent magnets. The dovetailed arms (evidently designed using #topology-optimization, and vastly overspecced) are held on with a very interesting plastic twistlock design. He measures the thrust as ≈3kg of weight (≈30N) using a US$8 load cell from Amazon, but the motor took 2½ seconds to spin up to full thrust rather than the 800ms for a much smaller comparable-thrust off-the shelf all-metal type. By #Michael-Rechtin. #mechanical #manufacturing
on 02024-06-25#video on #3D-printing a #flying radio-controlled model Orca tricopter (three ducted fans) from Command & Conquer with #topology-optimization and nylon powder “multijet fusion” which sounds like it doesn’t involve any jets at all. No notes on the electronics or software.
on 02024-06-25#video #toread about #3D-printing #mechanical parts with 25% glass filled filament
on 02024-06-25#BrandonMitchell #video footage from Donbas of #Ukraine FPV drone pilots #flying a small ducted-fan quadcopter in the house, then showing off a larger non-kamikaze quadcopter US$700 “Lucky Strikes” drone which apparently drops NATO and Polish grenades. Then they show multiple workshops and weapons including with improvised contact fuzes and tailfins (made by #3D-printing in some cases) installed on these grenades. The famous fragmentation sleeves on RPGs are also shown. They even seem to have a HEAT anti-tank warhead rigged up with 3-D printed tailfins to drop from quadcopters onto tanks. “FPVs are very effective against [sic] destroying armor. (...) NATO munitions are difficult to convert. So many safety mechanisms.” Footage of drone making. #3D-printing around the clock. Also shows FPV-driven remote-controlled cars for laying mines, with wheels and wheelbase similar to a four-wheeled push lawnmower. The radio signals still seem to be direct rather than relayed. Mentions a friend of his who nearly got killed three times because she didn’t know she needed to “anonymize” her Mavic drone (apparently something you have to do in these workshops). Lots of discussion of logistics, timescales, repair pipelines, parts shortages. He says, “We're losing the war. It's not lost, it’s far from lost, (...)”. Lots of discussion of how to raise funds on social media for the war. #weaponry
on 02024-06-25#BrandonMitchell #video footage from Donbas of #Ukraine FPV drone pilots #flying a small ducted-fan quadcopter in the house, then showing off a larger non-kamikaze quadcopter US$700 “Lucky Strikes” drone which apparently drops NATO and Polish grenades. Then they show multiple workshops and weapons including with improvised contact fuzes and tailfins (made by #3D-printing in some cases) installed on these grenades. The famous fragmentation sleeves on RPGs are also shown. They even seem to have a HEAT anti-tank warhead rigged up with 3-D printed tailfins to drop from quadcopters onto tanks. “FPVs are very effective against [sic] destroying armor. (...) NATO munitions are difficult to convert. So many safety mechanisms.” Footage of drone making. #3D-printing around the clock. Also shows FPV-driven remote-controlled cars for laying mines, with wheels and wheelbase similar to a four-wheeled push lawnmower. The radio signals still seem to be direct rather than relayed. Mentions a friend of his who nearly got killed three times because she didn’t know she needed to “anonymize” her Mavic drone (apparently something you have to do in these workshops). Lots of discussion of logistics, timescales, repair pipelines, parts shortages. He says, “We're losing the war. It's not lost, it’s far from lost, (...)”. Lots of discussion of how to raise funds on social media for the war. #weaponry
on 02024-06-25#video about #flying the amateur rocket “DIAMOND-X” with waypoints. Arduino, it looks like, with an SD card and an RS422 bus onboard, and servoed tailfins. But his “waypoints” are up in the air near the launch site, not far away on the ground. Largely made with #3D-printing; he regrets having made the parachute connection with carbon-fiber-filled PLA instead of nylon. No code shared, sadly.
on 02024-06-25#video #toread on #3D-printing “viral” tools “so you don’t have to” #manufacturing
on 02024-06-25#video on #3D-printing for #manufacturing #electronics #hardware with the Micronics SLS nylon printer #toread #Krasnow
on 02024-06-25the #Functional-Print-Friday #3D-printing website, with things like machine feet, tachometers, dust pickups, etc.
on 02024-06-25"Functional Print Friday" #video channel on #3D-printing functional parts
on 02024-06-25#video on how to design #flexures for #3D-printing. Unfortunately it’s pretty much just the same Snijlab living hinges and BYU CMR #mechanical things everyone makes, though BubsBuilds designed a flexure fractal vise. Recommends using nylon for FDM because it’s less vulnerable to fatigue than PLA, or PETG if nylon is too hard to print. Also make sure your slicer doesn’t position layer seams in the flexure blades, or change the number of perimeters there. Also you can adjust flexibility by changing the number of perimeters, i.e., “wall loops”. He also points out that short blades are more demanding and that you should use fillets.
on 02024-06-24#CNC-Kitchen #video on injection molding with #3D-printing (SLA for molds, and abusing the FDM nozzle to inject PLA into it). The SLA resin is glass-fiber reinforced and quite stiff. At first he didn’t preheat it, but started trying that in order to get the plastic to fill the mold. He finally had success by using a faster-injecting hotend, that time without preheating the mold. To be able to demold a cast with some undercuts, he made it in thermoplastic urethane (TPU) instead of PLA, which worked much better
on 02024-06-24#PDF slides on #pericyclic #gears for NASA. Uses straight-faced gear tooth profiles like a rack (I mean, a rack designed for interfacing with involute spur gears), which seems like it would be better than Retsetman’s toothform; they used #3D-printing in 17-4 PH stainless for the prototype. “Competitive with harmonic gears for Mars 2020 application investigated.”
on 02024-06-24#video about an “atmosphere powered battery” (like the Atmos clock, I thought, but it looks like he’s just using vacuum as a constant-force spring). The only interesting part about this is installing rubber syringe gaskets and transparent plexiglas tubes on a chassis made by #3D-printing. He ended up having to sandwich the syringe gasket between 3-D printed parts (with screws I guess) to keep it from popping off. Okay, maybe using cut timing belts as cables for power transfer is cool too. But basically I think this is dumb. Then he has a kind of cringey plug for PCBWay’s CNC services. Unfortunately the desktop-sized “battery” has an energy capacity of only 628 joules at about 10 watts, with what he said was 73% efficiency. My math: 1 atmosphere times 500mm (est.) per cylinder times circlearea(half 36mm) gives 412 joules. So maybe his cylinders are a little taller than I thought but basically it’s what you’d expect. #mechanical #energy
on 02024-06-24#3D-printing #video on #print-in-place #flexures #mechanisms that shoot a toothpick
on 02024-06-10#video of #3D-printing pressure vessels (tiny propane tanks) by spray-painting them with “dichtol” to make them watertight and gas-tight.
on 02024-06-04#video about #3D-printing buildings and why it leads to problems. Lots of talking heads and stock footage, but there is at least some footage of concrete 3-D printers. A lot of it seems to be about how you need trim to cover the seams between window units and lumpy 3-D-printed concrete. Also, coarser aggregate improves interlayer adhesion, but of course worsens tolerances and clogs nozzles. Smoothing rakes also help with that, I think, but he says they result in bumpier surfaces. Repairability is a problem.
on 02024-05-30#video of #Rack-Robotics’s DIY wire #EDM #machining rig, including #manufacturing it with #3D-printing from carbon-fiber-filled PLA; the power supply here is their “Powercore V2”, which is 200 watts at 70 Vdc output with “up to” 90% efficiency for US$400. He uses a jug of distilled water from the store. He says the Powercore is “expecting a 1Ω resistance”, so it doesn’t shock him when he puts his hand in the circuit, though I notice he doesn’t connect it across his two hands. He says the wire’s outer coating is zinc, not tin as I had guessed. He says the water circulation is 100 “psi”, and it seems to be moving at a pretty good clip parallel to the wire. He touts ±100μm tolerances on the current revision, which sounds pretty shitty for wire EDM, and for the next revision they’re still only targeting 50μm, so they’re really trying for the rapid prototyping market here, not the traditional ultra-precision market of wire EDM. The motors (“hybrid” steppers) are kept out of the water, using only mechanical linkages to move the toolhead and tension the wire underneath the water. They dunk it in a 10-“gallon” aquarium to hold the water. They’ve moved to Colorado Springs and gotten funded. (This video is from this week.) 180 watts output at 5kHz implies 36 millijoules per spark, which implies about a 14μF output capacitor.
on 02024-05-17#manufacturing snap-fits with #3D-printing #video by adding chamfers to widen the snaps at their bases, overextruding, using PETG or nylon, or printing on a 45° angle and rounding your bottom edges to prevent elephant-footing and diminish the overhang from printing on an angle, or printing on its side. Minnesota accent.
on 02024-05-16#3D-printing #slide-rule #video #toread
on 02024-05-11#3D-printing a bandsaw #video. Really just the table, trunnion, and blade guides; the frame, wheels, motor, and blade are the same as before, made of wood or metal, and the PLA and PETG parts are held together with steel screws.
on 02024-05-10#3D-printing #mechanical worm gears (though for some reason single-throated) and running them with no load and with or without grease. They melt at 8000 rpm when run without grease, but survive at least ten minutes at 12000 rpm with an unspecified grease. Printing the worms on a 45° angle with some support material works better than horizontal or vertical. #video
on 02024-05-02#Advanced-Tinkering #video about a homemade magnetron. Explains #vacuum considerations like vent holes for screw threads to prevent virtual leaks and face seals rather than radial seals (due to, he says, his inexperience). He used #3D-printing to make drill guides to transfer the precision of his 3-D printer to his drill and thence into stainless. He’s doing water cooling inside a copper plate in hard vacuum! But his water-cooling hoses aren’t exposed to vacuum. He’s powering it with the guts of a microwave and a half (one MOT and two oil caps) plugged into a variac. He got his metal parts machined by his video’s sponsor PCBWay. One of them cost him US$227, US$1170 for the entire magnetron assembly.
on 02024-04-28#video #toread about #mechanical threaded inserts for #3D-printing
on 02024-04-28#Harrison-Low #video about a #mechanical linear actuator design for a juggling robot, capable of a full 263mm stroke in 100ms. He’s mostly using carbon-fiber reinforced plastic tubes, with six 6001RS cartridge bearings for rollers (one too many for #exact-constraint), held in place by a piece made by #3D-printing, with interchangeable spacers to adjust the fit in 100μm units to the imprecisely-sized tubes. He’s doing the actual actuation with a kevlar-kite-string cable drive, with the cables actually run through teflon Bowden tubes so the motors don’t have to add mass to the actuator joints; the motor pulley has two V grooves for the two ends of the cable. This seems like a good way to do robotic #mechanisms in general. This replaces his first hydraulic design made out of syringes and a second iteration using a ballscrew which was too slow and (I assume) also super expensive. He has an AS5048 magnetic encoder for positional measurement, coupled to the actual moving parts with a constant-force spring, whose rotation is what it measures, but so far he’s just using encoders on the motors themselves (which I guess are brushless since he’s using #ODrive; in fact, the motors are ODrive-branded, model D6374-150KV). He says ODrive's current sensing “completely removes” the need for limit switches. His attempts to clamp the three frame tubes with a flexure from the inside failed, but I don’t know why he doesn’t clamp them with a flexure on the outside, instead relying on hammering them in. He uses a thin wire with a hook bent on the end as fish tape to pull the kevlar string through the teflon Bowden tubes, but doesn’t always need it because of how stiff the kevlar string is. On one occasion the kevlar string was able to friction on the 3-D printed plastic and just cut right through it, presumably from heat (a big advantage for kevlar over UHMWPE, except when you want to cut it; presumably kevlar will creep less for the same reason). #robotics
on 02024-04-28designing strong parts for #3D-printing #video using a pinch collar for his drill press as the example, discussing slicing direction and how perimeters are stronger than infill.
on 02024-04-06#3D-printing mysteries that need to be solved in 02024 #video #toread #clickbait
on 02024-04-06#Angus recommends “best free CAD” software for #3D-printing. #clickbait carefully omits any actually free CAD software! #video
on 02024-04-06#3D-printing design for vase mode #video #toread
on 02024-04-06top 10 tools to make with #3D-printing #video #bootstrapping by #Zack-Freedman: a mouse bungee to retract your mouse cord, a USB cable holder, some kind of camera holding thing, battery-holding inserts for an Altoids tin (to contain lithium-ion fires), a tiny shelving unit for Altoids tins, a screw sorting jig, a folding filament spool for a 3-D printer, a three-inch-long skateboard, a 3-D printing filament spool support, a solder paste dispenser, and a Dremel bit organizer. Pretty lame and disappointing overall.
on 02024-04-06#electroplating with gold after #3D-printing #video #manufacturing #toread
on 02024-04-05DIY metal #3D-printing with a TIG welder bolted onto an Ender 3 by #Cranktown-City. He does successfully TIG-print a watertight vase after enough work. This worked much better than his previous MIG printing, but it’s still blobby, and he has layer shifts as if from missed motor steps. #video
on 02024-04-05#Sanladerer Peopoly Magneto X printer #3D-printing #video It uses linear motors with closed-loop feedback (from a magnetic-strip DRO) for the X and Y axes, though still using leadscrews for Z (four of them, on steppers, moving the bed; the independent steppers allow it to do auto-bed-leveling using something like a load cell in the toolhead). It is large and heavy. The main controller is a Pi Zero2-1GB (which you can see booting Linux on the 7-inch micro-HDMI touchscreen), and then Klipper Adapter V1.0 I guess for the real-time electronics, and an ESP32 board that talks to the motor drivers over RS-485. The main motor control board is Bigtreetech Octopus Pro, which drives a couple of custom boards with big MOSFETs for the linear brushless motor drivers. He had to do some minor repairs with his lathe to get the bed leveling to complete. It did 64-point “mesh bed leveling” for bed height compensation, which found errors from -0.15mm to +0.11mm. The printhead has two fans blowing onto the workpiece through shrouds on opposite sides and another larger fan blowing air through the heatsink in the cold zone of the extruder. He crashed the extruder into the print bed, damaging the printer, wishing for “software endstops”. He had some problems with extruder flow control and underextrusion, while top solid surfaces were overextruded.
on 02024-04-05#SunShine accidentally made an e-bike by #3D-printing; apparently he just drives the rear rim with a 3-D printed helical gear driven by a drone motor held in place with some T-slot aluminum extrusions. #bicycles #video
on 02024-04-04#CNC-Kitchen #3D-printing with hot glue #video apparently it is possible with a filament oiler to use a regular 3-D printer hotend with EVA glue sticks ground up in a blender (after freezing) and extruded into a very floppy filament. It prints crystal clear but of course has lots of stringing. It’s very soft, like a very soft TPU.
on 02024-04-03#3D-printing flexible living hinges #video Doesn’t credit Snijlab, but then Snijlab deleted their web page on the subject, so they don’t even credit themselves. There’s an interesting sheet-cutting design for a half-dodecahedral bowl using five fasteners (“this little retaining clip”) with split-pin clips on them at 10'10", a connector somewhat similar to a certain construction set I had as a kid. Somewhat perversely they’re using FDM for designs that are basically sheet-cutting designs. Another interesting thing is that apparently current popular slicers (like Bambu Lab’s) support CSG operations, so you can “Add negative part” on the right-click menu and cut holes in things.
on 02024-04-03#CNC-Kitchen #video about calibrating #3D-printing devices (especially DIY 3-D printers) for #manufacturing #precision, discussing elephant-foot, corner over-extrusion, over- and under-extrusion, and skew (non-perpendicular X and Y axes). He recommends Vector3D’s £5 CaliFlower calibration STL file, which offers inside and outside measurements in X and Y over 50 and 100 mm, and then diagonal measurements of 100mm. With chamfers on the top and bottom to prevent elephant foot.
on 02024-04-03#3D-printing bores #video #toread
on 02024-04-03#3D-printing a fractal ball vise. #manufacturing #bootstrapping #video He fills the ball with scrap steel as aggregate in concrete to make it heavier and I guess more massive for hammering. Basically it’s a weighted concrete near-sphere with a PLA skin resting on a rubber O-ring on a concrete base.
on 02024-04-03adding metal parts to #3D-printing plastic with FDM. This seems to be a Stratasys ad. His first example is 3-D printing toothed-belt pulleys for a metal roller-chain sprocket; he pauses the print in the middle to insert the sprockets, which the rest of the plastic captures. Also mentions cartridge bearings, captured hex nuts (cheaper than brass inserts, more resistant to rotation and pullout), and a captured bronze bushing, also inserted during a printing pause. Another technique he shows is inserting 3-D printed parts into a 3-D-printed assembly during a printing pause in order to get the same fully-captured benefit without needing support material for overhangs. Then he demonstrates inserting roller chain and metal-screen filters during printing pauses, and inserting carbon-fiber-reinforced plastic rods during printing pauses to stiffen quadcopter arms. #manufacturing #video
on 02024-04-03#3D-printing and #electroplating #tutorial with graphite. He’s using an LCD SLA printer to get nice smooth prints and graphite spray paint, but shows that some graphite paints are not compatible with some automotive body work putties, because the paint cracks. He’s measuring 12.5kΩ between points a few centimeters apart, which is similar to what I get with a pencil on paper, but after he burnishes it with a towel, he gets only 5kΩ. To burnish his Benchy he tumbles it in walnut shells for four hours. He uses an unspecified commercial bright acid copper electrolyte for the initial plating, using coffee filters for the anode bags on his copper anodes. He recommends using a constant-current power supply with 1A/dm² while rotating the workpiece, but he suggests also using the voltage (0.6–1.0V) to tell if your current setting is right! He gets a lovely mirror finish with his trade-secret electrolyte composition, but then sands and buffs it. Before plating gold, nickel, or silver over the copper, he suggests galvanic degreasing, using a stainless steel anode and 6V; he applies gold with a galvanic brush (electrolyte not disclosed) and 6 volts. #manufacturing #bootstrapping #video #electrolysis
on 02024-04-03#Alpha-Phoenix first-surface mirrors. #optics #video he’s using the silvering process from the Tollens #materials test (silver nitrate, lye, ammonia, and a reducing sugar). Probably this process would be useful for #electroplating non-conductive objects as an alternative to graphite paint. He prints some things in an unspecified plastic with FDM #3D-printing, sands them, applies a two-part epoxy filler (“XTC-3D”) to smooth the surface, and silvers it by spraying precursors from a commercially-bought silvering kit onto it. To keep the resin from dripping off before it cures, he rotates a part slowly on a slanted axis so that it drips back to where it started. This introduced errors far too large for #optics. To try to silver the surface evenly he added a surfactant. In one batch, his epoxy reacted with one or more of the sprayed precursors, getting silver but with a terrible surface finish. In fact, that kept happening afterwards; he found that he had to cure the resin indoors (heat? humidity?) and needed to have the resin component ratio skewed toward component “A”.
on 02024-04-03#3D-printing a casting pattern, the quick and dirty way, using a Prusa I3 MK3S FDM printer, using a plastic called PVB, brand #Polycast, “designed to burn out very cleanly”. Dude is wearing my slogan. Lots of time-wasting talking-head footage. He also mentions you can smooth the prints with isopropanol, and that he was able to glue it that way too. He brushed plaster on the surface of his print so he wouldn’t have to degas his plaster. He recommends casting in Zamak, which he melts in a soup can, rather than aluminum, and using hardware store ductwork sealed with aluminum HVAC tape to hold the plaster. To my surprise he claims Zamak is cheaper than aluminum, and that most plumbing fixtures and towel racks are Zamak, both of which I think are wrong. #manufacturing #bootstrapping #video
on 02024-04-03#Integza DIY metal #3D-printing by strapping a MIG welder to his FDM printer. He did, surprisingly, get it to work to some extent. #bootstrapping #video
on 02024-04-03DIY metal #3D-printing (SLM of 316 stainless) #bootstrapping with a 155-watt #laser coupled in through a fiber running at up to 300mm/s, getting better results at higher speeds and higher powers. Wow, I had no idea that surface tension gradient with temperature was a thing, but apparently you can reverse it by adding sulfur to stainless, resulting in a reversal of Marangoni convection! Eventually his 3-D printed ASA lens housing overheated and hazed his lens and fiber. #materials #video
on 02024-04-03#Prusa-3D #electroplating after #3D-printing, with some simple instructions but no electrolyte recipes. #video
on 02024-04-03#3D-printing 12 tools: a parallelogram center finder (in which M3 bolts for use as pivots cut their own threads) for boards or square tubing; a square-corner center finder for circles or squares; a center finder for a drill press for centering the drill over round stock with a sort of indicator needle, also with a non-self-tapping screw tapping its own hole; a metric screw measuring gauge with both length and diameter, bas-relief labels colored with a sharpie; a similar fillet gauge; a lockable angle gauge for transferring angles; a lockable contour gauge (like a one-dimensional bed of nails, or a pack of cards, as one commenter suggests), with more self-threading bolts, M4 this time, and a cam lever for locking; a sanding block; tiny “paint cones” for supporting objects being spray-painted on points; the THWACK plastic hammer; a flexure-based tube cutter into which you screw a box-cutter blade, which makes “extremely nice flat cuts” on the ends of silicone tubes; a machine vises with a screw clamping mechanism; a Kant-Twist-style clamp. He also calls out things he didn't print, like a Dremel table-saw/disc-sander/shaper mounting, a hand-held drill guide for guaranteeing perpendicular drill movement, etc. #video #manufacturing #mechanisms #teaching-tech
on 02024-04-03#3D-printing 28 useful tools. #video Toothed glue spreader, screwdriver bit holder, sanding block, collet-style drillbit depth stop, bench dogs for a work table (that fit in its holes), speed square, screw measurer, fillet gauge, stepped keychain hole diameter gauge, Makita battery/charger/tool wallmount holders, corner templates for drawing radiused corners to cut off things (and there are router templates too), C-clamps, pocket hole drilling jigs for carpentry joints, 45° and 60° drill guides, bed scraper to avoid damaging 3-D printer beds, Dremel drillbit sharpening jig, hand trowel, 3D-printer nozzle wrench (using a piece of steel I guess), vacuum cleaner hose adaptors, deburring tools (or more accurately deburring-tool handles), cable soldering jigs, etc. Video begins with a couple of minutes of worthless filler and has annoying music throughout and frequently talking heads.
on 02024-04-03top-10 must-have #3D-printing tools: crème brulée torch (for removing hairspray residue, stringing, stress whitening), isopropanol spray bottle, microfiber cloths, deburring tool, PVA glue stick, an assortment of pliers, a set of files, a silicone lubricant, needles for nozzle cleaning, hex screwdrivers. Mostly talking-head filler; #LoyalMoses is plonked. #video
on 02024-04-03#3D-printing without layer lines using “fuzz”. He gave up on #manufacturing with a resin 3-D printer because he kept getting warped parts. Lots of timewasting talking-head footage, which is aggravated by the shitty background elevator music (#Jake-Grim). He tried texturing the surface with Blender first, but didn’t know how to use it, so ended up using the “Fuzzy skin” feature in Bambu Studio; with 0.3mm "fuzz distance" and 0.3mm fuzz thickness, the texture is similar to the texture of his heated bed. A commenter suggests using variable layer height. #video
on 02024-04-03#Proper-Printing #3D-printing gel of UV-curable resin, as if with FDM, maybe filled with silica fume to thicken it. He was able to do vase-mode printing but not bridging. #manufacturing #mechanical #video
on 02024-04-03solid-state dehumidifier for #3D-printing #video. It uses electrolysis to pump hydrogen through an ion-selective membrane out of your dry box.
on 02024-04-03conical slicing for FDM #3D-printing without support material #video
on 02024-04-03making a wax seal #video by #Uri-Tuchman. Lots of #manufacturing brass and wood parts on a lathe, pantograph, handsaw, bandsaw, router table, hand file, etc. He tried making a form for the pantograph with an Elegoo LCD SLA printer, modeling it in Blender, but gave up. #3D-printing
on 02024-04-03nanoporosity in #3D-printing #materials made from nickel prevents dislocations from propagating and thus increases strength
on 02023-09-22an #inkjet #3D-printing powder-bed machine using an HP 45 600-nozzle cartridge
on 02022-02-06apparently JStark died of heart failure two days after being arrested (but not in custody) two months ago #3D-printing #weaponry
on 02021-12-20#3D-printing #weaponry in #Burma (JStark’s FGC-9)
on 02021-12-20"Dollo", another #self-replicating #RepRap, with a building-blocks frame. #3D-printing
on 02021-12-08"Snappy 3", “an Open Source RepRap 3D printer designed by RevarBat from July 2014 to January 2018. It is a true RepRap, using very few non-printed parts. This design needs no belts, pulleys, metal rails, and almost no screws other than to mount parts to the motors. This means that you should be able to put one together for about $216, including the price of plastic to print parts. The entire thing snaps together, and you should be able to assemble it from parts in only a couple hours. The few required non-printable parts are available world wide from a variety of suppliers.” #self-replicating #RepRap #3D-printing
on 02021-12-08"Mulbot", open source mostly printed 3D printer “square rail type 3D printed housings for linear bearings. Since the bearings and rails are printed they have been integrated into the frame members. 4.5mm G100 Stainless Steel bearings balls are used to recirculate through the bearing housings to reduce fiction and to provide preload to remove bushing slop. All three of the printers drive systems are 3D printed as well. The Y-axis is driven by a 3D printed herringbone gear rack and pinion. The combination of 3D printed drive and idle pulleys and a TPU belt drive the X-axis hot end carriage. While the Z-axis utilizes 3D printed trapezoidal lead screws and nuts to translate the hotend vertically.” #3d-printing #self-replicating #RepRap
on 02021-12-08"ReChain" is #mechadense’s #reprap design for a proposed class of #mechanical frame systems for #3D-printing, robots and structures that totally abjures the use of frictional fasteners and “naïve use of clips”, instead using only tension to get stiffness.
on 02021-11-10"Root CNC", another 3-axis or 4-axis #CNC router built with #3D-printing, stepper motors, and ballscrews
on 02021-11-03"printNC" is another 3-axis #CNC router with parts made with #3D-printing on a steel gantry, CC-BY-4.0
on 02021-11-03Max Fischer’s notes on building a #CNC machine with 3-D printed parts based on Ivan Miranda’s design, clamping a Makita handheld wood router onto a gantry. #3D-printing
on 02021-11-03#PEEK #3D-printing filament with service temperatures to 250°
on 02021-07-15Globoid worm drive for #3D-printing using a new (2017) "sweep" primitive in #OpenSCAD
on 02020-10-17#3D-printing of sandstone in a fractal "Digital Grotesque II" for the Centre Pompidou.
on 02017-07-17Massimo Moretti’s WASP BigDelta #3D-printing machine is an adobe-depositing deltabot, using mud rather than plastic
on 02017-04-12a 100μm layer height SLA #3D-printing machine for US$1250
on 02017-04-02introduction to #topology-optimization with applications to selective laser melting (SLM) #3D-printing
on 02017-03-11#video of #3D-printing houses from adobe with the Big Delta WASP
on 02017-03-10the best #video to demonstrate #powder-bed #3D-printing, of the “Plan B” open-source printer.
on 02017-03-09Shapeways briefly offered a powder-bed #3D-printing process that involved baking the whole tray before removing the item, but “it did not meet [their] quality standards.”
on 02017-02-24This Data Clay project is about #digital-fabrication (including #3D-printing) of #ceramics made from clay. The website is shitty and full of “coming soon” pages, but there are some interesting projects anyway.
on 02017-01-05#SexyCyborg’s #3D-printing plans for her “pentesting platform shoes” with secret compartments, cc-by-sa. Only in STL, no source code.
on 02016-11-21#SexyCyborg’s photo essay on pentesting using 3D-printed high heels concealing various #security tools, like an OpenWRT dropbox. #3D-printing
on 02016-11-21#weev says (I’m guessing that) he isn’t attacking the USA yet because of “lack of adequate additive manufacturing technologies to guarantee sustainable victory,” i.e. #3D-printing #drones. Google cache gives the now-deleted context, “Even if I had the drone army now, it wouldn’t be the time” #white-supremacist #politics
on 02016-10-11a Zortrax M200 printer caught fire because the heater cartridge fell out because its owner didn’t properly tighten down the nut and the firmware didn’t notice. #3D-printing #hardware #safety
on 02016-10-10#3D-printing #hardware from Wanhao: the Duplicator i3 costs “somewhere between 300 and 500 dollars”. Folded sheet metal, based on the Prusa i3, with an MK10 extruder, LM8UU linear bearings, Acme leadscrews with brass nuts, and cable chains.
on 02016-10-10Midwest #RepRap Festival. Lulzbot seems to be catching up; dual-head extruders; SeeMeCNC’s auto-leveling with accelerometers. #3D-printing #hardware
on 02016-10-10a #PDF of a super widely cited 2011 #paper on #topology-optimization for #3D-printing, showing some results they got with graded density etc.
on 02016-09-22#pdf #paper on automatically modifying #topology-optimization results for #3D-printing (in this case, FDM), which mysteriously doesn’t seem to have considered incorporating the #manufacturing constraints into the objective function.
on 02016-09-22#pdf dissertation by Benjamin Vayre in French on #topology-optimization for #3D-printing by electron-beam melting, with a bunch of interesting-looking results. Mentions the acronym DFAM, “Design for Additive Manufacturing”. Mentions topology optimization. Proposes the following design process: analysis of specification → initial form generation (either manually or through topopt) → choice of orientations during manufacturing → geometry optimization → validation → maybe start over. Apparently the dude designed a mounting bracket for his dissertation using off-the-shelf software at the University of Grenoble. I guess not every university can afford to have standards. They have a wicked mounting bracket and e-beam melter though.
on 02016-09-22#metamaterials (“mesostructures”) via #3D-printing in order to achieve customized and graded elasticity. Still, they seem to just be replacing struts with coils, mostly, although there are some other #flexures mentioned. #manufacturing
on 02016-09-22#pdf #paper with lots of results of #topology-optimization made by #3D-printing. They wrote and published a MATLAB program called TOPSlicer to translate topology-optimization results to useful formats. #manufacturing
on 02016-09-22#pdf #paper on “Multiple-Material #Topology-Optimization of Compliant Mechanisms (#mechanical #flexures) Created Via PolyJet #3D-Printing”. It says that multiple materials has the potential to eliminate the need for thin, weak sections. (PolyJet is a process that selectively deposits either of two liquid resin monomers and polymerizes them with UV. One of the resins is an elastomer.) Their results do not seem to justify that level of enthusiasm, as they still contain thin, weak sections, and they don’t seem to have measured the output force. #manufacturing
on 02016-09-22A 2012 #paper on design for #3D-printing #manufacturing in metals. Not much about topology optimization AFAICT.
on 02016-09-22#STL for #3D-printing Wu Ying platform shoes with space for smuggling
on 02016-07-06“#SexyCyborg goes Pentesting”, a young woman in a tight-fitting dress #3D-printing some PLA shoes with space for #security penetration testing tools, like a “drop box” and a USB keylogger.
on 02016-07-06STL models for #3d-printing of models of NASA #space things, including Vesta
on 02016-07-04