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This machine 3D prints metal structures in midair by lasering nanoparticles | Any Tech news
Home / Gadgets / This machine 3D prints metal structures in midair by lasering nanoparticles

This machine 3D prints metal structures in midair by lasering nanoparticles


laser-assist-printing-socialmediaGIFOne limitation of run-of-the-mill 3D printers is that the structure must essentially be built as a series of layers, each one supporting the next. A new device from Harvard’s Wyss Institute allows metal filaments to essentially be drawn in midair with no support whatsoever. And it uses lasers!

There’s no fancy name for the technology yet (unless laser-assisted direct ink writing counts), but the gist of it is this: A nozzle moves along a preset path sending out a thin stream of silver nanoparticles, while at the same time a laser follows its progress, heating the particles and solidifying them into a freestanding filament thinner than a human hair.

Inside the nozzle, the flow of nanoparticles has to be precisely controlled to keep the metal thread’s width uniform, and the laser must adjust as well so as not to leave any particles un-annealed, or apply too much heat and solidify the ink inside the extruder.