This is a small handle for standard 1/4" screwdriver bits. It's incredibly handy for getting into tiny spaces that are too short for a standard screwdriver.
This was inspired by 4 Volt's Small Hex Screwdriver Handle. http://www.thingiverse.com/thing:137367 Thanks 4 Volt!
The big change in this vs. 4 volt's model is the smaller size. The total height with a bit installed is 1.1 inches/28mm. Additionally I've added a small through hole so bits can be pushed out using a small pin or nail. The Bit size and clearance are parameterized in the Fusion 360 model if you need to fit a different sized hex bit or want to adjust the clearance for a looser fit.
The example model was printed with a 0.1mm layer height 50% infill in MonoPrice PLA. The part was designed in AutoDesk Fusion 360. .STL, F3D, STEP, and IGES files are attached.