See how this 3D-printed gear turns clockwise no matter how it's cranked

I have a screwdriver that uses this mechanism so the bit will only turn one direction while you turn the handle in either direction. You have to hold a knurled center section for that action to work, though. Otherwise it just acts like a normal ratcheting screwdriver. It actually works pretty well.

Apparently it’s called a ‘double drive’ screwdriver. I’m seeing a lot of Kobalt ones, but mine is some off brand I’ve never seen before or since.

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