I wanted to be able to fit my screwdriver and bit set into the extra pocket for my multitool holster. This uses 6mm magnets to both attach to the driver and hold the bits in place, fits in reasonably well to the holster.

Cad model here:
https://cad.onshape.com/documents/bd5e7ab997b54da83afc3e2f/w/46459aa789157d62d4e4c264/e/803a1eadb6eec5c57abd8823

I had best results with printing vertically and no supports are needed