Teen Designs And Builds A Robotic Hand With Only LEGOs

He first designed the hand digitally and it has two motors and four fingers with two tendons in each. The hardest part of the design was the tendon routing around the rotating bearings in the fingers, which allows the joints to bend and the finger to flex or extend when the tendons are pulled. In total, the hand includes over 100 bearings—components involved in rotation—and Jared even found a way around the fact that, unlike the 3D-printed SoftHand-A, LEGOs don’t  have springs. 

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