A box of 3-D models 24-year-old student Amos Dudley made of his teeth. The model labeled "3" rests on a 3-D-printed tray Dudley made to make impressions of his teeth with a putty-like material. Also in the box are a clear plastic aligner and other 3-D models used to make more aligners, each one pushing the problematic teeth further into place. Jon Kalish for NPR hide caption

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New Jersey Student Uses 3-D Printer For DIY Dental Work

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A "new" Rembrandt portrait is actually the creation of a 3-D printer — and a statistical analysis of 346 paintings by the Dutch master. Robert Harrison/J. Walter Thompson Amsterdam hide caption

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A 'New' Rembrandt: From The Frontiers Of AI And Not The Artist's Atelier

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For 3-D food printers, chocolate is a good material to start with, because it's fairly simple to make it liquid inside the printer cartridge and solid once it drops out. Courtesy of Smart Gastronomy Lab, University of Liège hide caption

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Cambrian Genomics says that what it calls a DNA printer is essentially a DNA sorter — it quickly spots and collects the desired, tailored stretch of DNA. Courtesy of Cambrian Genomics hide caption

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DNA 'Printing' A Big Boon To Research, But Some Raise Concerns

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Liam Gaynor (center), 8, and Laura Stark (right), 8, watch as an object is made on a 3-D printer at the Hillsdale (N.J.) Public Library in January. Michael Karas/North Jersey/Landov hide caption

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Libraries Make Space For 3-D Printers; Rules Are Sure To Follow

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Artists in the residency program at Autodesk are given access to production-quality equipment in workshops, allowing them space to create at-will. Blake Marvin/Courtesy of Autodesk hide caption

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Artists In Residence Give High-Tech Projects A Human Touch

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International Space Station Commander Barry "Butch" Wilmore holds up the first object made in space with 3-D printing on Nov. 25. NASA hide caption

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To Boldly Go Where No 3-D Printer Has Gone Before: Yep, Space

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Army researchers will try to find ways to 3-D print nutritious food with less heavy packaging than the current military meals. Aarti Shahani/NPR hide caption

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Army Eyes 3-D Printed Food For Soldiers

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Garrett shares a moment with his mother, Natalie Peterson. "He has been doing so good," she says. "He's been smiling." Nicole Haley/University of Michigan Health System hide caption

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Doctors Use 3-D Printing To Help A Baby Breathe

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