One in 1,500 children is born with a partially formed upper limb. But for every child who receives a prosthetic device, hundreds go without. Many families cannot afford a hand replacement, which often costs thousands of dollars, while others find that, after shelling out for a fancy new prosthetic, it performs poorly or the child outgrows it. Now, a volunteer-driven movement is striving to solve that problem by creating cheap, durable 3-D-printed hands. Coordinated by an organization called e-NABLE, the effort has so far distributed more than 400 plastic hands, which can be printed in a range of colors and go by names such as the Raptor Hand and the Cyborg Beast.
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