Screwdriver

Screwdriver handle that uses two ¼" o-rings to secure the bits. There's 6 different versions: one uses a 4-in-1 bit (Bestway) and another that uses 150mm bits (search for: uxcell PH2/SL6 Magnetic Double Head Screwdriver Bits, 1/4 Inch Hex Shank 5.9-inch Length S2 Power Tool), an EZpower brand bit, and there's also 2 different ones for ¼" that you can press or hammer in for dewalt and milwaukee bits, and finally a blank one if you want to add your own thing. The handle feels like it melts into your hand, very comfortable and compact, yet still providing a lot of torque. Print with 3mm shell and 70-98% infill. Use a small screwdriver to put the o-rings in the grooves.