Made this small handle so i can use the bits for my electric screwdriver as a regular screwdriver. also, you can stick 3 bits into the end of the handle so it can be a bit holder too.

Also added a small socket for a 5mm neodyum magnet for keeping the bit in place while in use.

Keep in mind that i made this for my hex driver bits with 3mm shaft, so it might need to be modified slightly for your needs. Also, you might have to scale it, depending on your printer's accuraci, and setup. +/- 1-2% in scale, to find your optimal fit for your bits.