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As a child, Hod Lipson lost Lego pieces constantly. Now the 39-year-old director of Cornell University’s Computational Synthesis Lab can build replacement parts on the spot. Completed last year, Lipson’s fabrication machine, called a “fabber,” can print thousands of three-dimensional objects, everything from toy parts to artificial muscles, using dozens of materials, including PlayDoh, peanut butter and silicone, by following simple directions sent to it by a PC. . . . [A]mateur inventors worldwide are now manufacturing their creations from the comfort of their own homes. The next step is to make a desktop machine that prints other machines, such as robots, complete with circuit boards.
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