Three-dimensional printers — machines that can fit on a desktop and create 3D objects from plastics, metals, and other raw materials — can do just about anything. High-precision jets pump out custom medical implants at the press of a button. Carbon-fiber printers spit out automobile prototypes with jaw-dropping precision. And off-the-shelf modelers generate custom toys, jewelry, home decorations, and clothes with no more than a digital file.
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