It's historically been tough and slow-going to 3D print objects made from multiple materials. Now, Harvard researchers developed an ingenious nozzle that enables the 3D printer to spew out eight different materials at the resolution of a human hair. To demonstrate the system, they printed fantastic flexible origami structures and even a "soft" robotic millipede from a variety of epoxy and silicone elastomer inks. Mark A. Skylar-Scott, Jochen Mueller, and their colleagues from Harvard's Wyss Institute for Biologically Inspired Engineering presented their work in the scientific journal Nature: "Voxelated soft matter via multimaterial multinozzle 3D printing"
McChristian says, "Rather than send/give out Holiday Cards this year, I decided to make punch and assemble Holiday 'kits.' The sleigh and reindeer were models found on Thingiverse, and I designed/printed the evergreen tree and the label."
3D printing is a dumpster fire of stupid, obvious patents, but thankfully many of these are expiring; this year, the stupid patent on putting sides on a 3D printer (extrusion printers are very sensitive to errant breezes and just a puff of wind can ruin a print that took hours, just minutes before it completes).
I've been semi-seriously joking about "AK-3DPs" (3D printed assault rifles) for years, and while the attempts to limit the spread of 3D printed guns have been sloppy and poorly formulated (as have the Trump admin's attempt to roll them back) the state of the art is still progressing.
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