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NEMA 17 Hand-Crank Generator Grip
This handheld grip turns a spare NEMA 17 stepper into a hand-crank generator for STEM demos, LED lanterns or charging capacitors. It has a 6 mm faceplate with a 31 mm square counterbored M3 bolt pattern and a 22.4 mm through-bore that clears the 22 mm pilot boss, so the 5 mm shaft comes out the bottom for your crank. The 110 x 26 x 22 mm hollow handle carries the motor leads through 7 mm wire ports at each end, and the whole part is 156 mm long.
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