Small end cap to get more torque from those mini screwdrivers. This is a very basic design but works well. Very minimal material is used - perfect for using up the remaining bit of filament

Suggested material for printing is PETG although PLA will work well too. I printed my personal one from a Matte PLA.

The fit on these adapters is somewhat tight, which prevents the screwdrivers from coming out during use (they can still be pulled out with your fingers). If you do not want a friction fit, scale up the parts to 105% in your slicer.

This model is designed for screwdrivers that have an edge-to-edge distance of ~7.3mm:
 

If your mini screwdrivers have a different hex size, feel free to scale these!