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Discover two creative ways to make your own fidget spinners using bicycle chains, ball bearings, and simple tools! This tutorial covers both a four-arm design and a multi-lobed ring spinner. Follow ...

Additive manufacturing, also known as 3D printing, has been around longer than you might think. The first idea for a 3D printer was filed back in 1981 by Hideo Kodama of the Nagoya Municipal ...