A compact screw driver with a rotating palm rest.
(Photo outdated, it now has a stronger connection for palm rest)

I recommend 3 or more perimeters for the screw driver and to print the endcap solid 100% infill or a high perimeter count.

I have been using this almost daily now for 4 years, I have been really happy with the look and feel.

This uses a 4x4x11mm magnet to hold the bit in place. If you don't have the size of magnet then glue could be used for more permanent assembly.

If you have a magnet you wish to use let me know the size and I will mod it for you.

2-7-20: Uploaded slightly longer version of the screwdriver to better grip the bit.
2-7-20: Added ribs for the end cap to prevent it unscrewing itself.
1-8-18 Removed old version of swivel end cap.
1-8-18: Added a version that can hold a hex key and the stem parts. Thanks Andrux51 for the idea.
3-15-16: Added a version without the palm rest swivel end cap.
3-16-16: Added V2 with a screw on two part end cap that is less prone to breakage.

Print instructions

Print standing on back end.
Add perimeters for extra strength.