another remix from 4volt's Small hex screwdriver handle....but with captive magnet and customizable.
adjustable handle size, bit length, and magnet size and shape
This customizer was one of my first ones, and when I red the script again i thought "omg did I do that!"
So I write it again, with printer tolerance tunning...
pause print for captive magnet
you can use round or square magnets
i recomand round's one ;
don't forget to pause print
let it cool a bit, then use 2 or 3 drops of superglue to fix the magnet.
Wait long enough that superglue dries or you will have some troubles at restart :P
For PLA users
it might not fit with hex bit at begin
Let it cool, then blow hot air with a hairdryer or a hot gun in the hole (be carreful with hot gun), and try to fit a hex bit. Warm also the bit with the hairdryer. Repeat it until it fit correctly