This Handheld 3D Printer Could Let Doctors “Draw” New Bones

This Handheld 3D Printer Could Let Doctors "Draw" New Bones

Waving a magic wand over an injured bone to create a custom, living repair patch sounds like something out of I, Robot. But researchers have created a handheld 3D-printing pen that could someday do just that. It’s not magic, it’s science.

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