This is a 3d-printed cap for the Klein tools 14-in-1 Precision Screwdriver/Nut Driver (Model #32314), that prevents the bits from getting knocked out or damaged, or poking holes in the tool bag.  

Printed on a Prusa XL with a 0.6mm nozzle, in PETG with no supports and 0.2mm layers, the result is a press-fit that won't fall off the tool, but will pull off the tool without pulling the tool assembly out of the handle.

Fusion CAD file included so you can modify as necessary.