They can print out a lot of things, including computers, but not the kind we use today. The tolerance is on the order of 1-100 microns (depending on the material) for the better printers, where today's circuitry is tens of nanometers (or 0.010's of microns). The best 3D printers cost 2-10M USD and are only seen in industrial settings. Ones with lower tolerances that cost a few 100k USD can often be found in medium sized companies or at the university level. My father in law owns a set production company (for Broadway and other theaters - they design and make the sets), and they have one like that. The biggest issues right now are we're limited to synthetic materials, we have little to no control over atomic/molecular defects, the process takes forever (it would take a full day for a 4"x4"x4" part) and most metals and ceramics are limited in the <atomic> phases that can be produced, since the starting material is usually a metal precursor or sol-gel.
Originally Posted by Exorcism
