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Using 3-D printers to replace a hand

Ethan Brown, 8, adjusted his Cyborg Beast hand. Materials for a prosthetic hand made on a 3-D-printer can cost as little as $20 to $50. Some specialists say they work just as well, if not better, than devices that cost much more.

Kevin Liles/New York Times

The proliferation of 3-D printers has had an unexpected benefit: The devices, it turns out, are perfect for creating inexpensive prosthetics.

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