This light-powered 3D printer materializes objects all at once

3D printing has changed the way people approach hardware design, but most printers share a fundamental limitation: they essentially build objects layer by layer, usually from the bottom up. This new UC Berkeley system, however, builds them all at the same time, more or less, by projecting a video through a pot of photosensitive resin. The device, which its creators call the replicator (but should not because it is a trademark of MakerBot), is mechanically quite simple. It is difficult to explain it better than Hayden Taylor of Berkeley, who led the research: Basically, you have a standard projector, which

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