#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 02025-11-21another #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 02025-03-22#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#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#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#CNC-Kitchen Joe Larso’s #PrintABlok #construction-set with square studs on multiple sides of the bricks. The square studs are actually spring snap fasteners! Printed as separate pieces! #video
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