4mm Bit Driver, Pocket Sized

I wanted a pocket sized screwdriver with a few different bits to carry around when I'm working. Couldn't find what I want, have printer, enjoy technical modeling. So I figured I had no choice but to make my own. It's built for the 4x28mm bits you'd find in many of the small multi-bit sets most of you probably already have.

This prints very well with supports on an FFF printer. Feel free to tweak and redistribute as you see fit. Many thanks to everyone before me who have tackled all the scad formulas that got me started.