Cordless Electric Screwdriver.
thingiverse
I love my Xiaomi Wowstick :) Here's a link to it: https://youtu.be/ylSTWNLuFXM I'm using a DC-3V-6V mini 10mm planetary gear reducer motor, which I got from eBay here: https://www.ebay.com/itm/DC-3V-6V-Mini-10MM-Planetary-Gear-Reducer-Motor-Coreless-Motor-For-Robot-/292030496930 The bearing is a 686ZZ (6mm x 13mm x 5mm) one. This motor with planetary gear is pretty weak, so the Wowstick is more of a toy than a real tool. However, I found this other thing on Thingiverse that's way more powerful: https://www.thingiverse.com/thing:2531922 It can unscrew several screws and even drill small holes in wood!
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