At work I have to carry around a bunch of different hex bits all the time, so I designed a little holder for my pocket.

It holds 4x 1/4" standard bits and one 5/16" bit (Torx50) and has a little hole for a leash.

During the print you have to insert 3x 10x2 mm magnets. I used the color change function of PrusaSilcer for this, it stops the printer and moves the printhead out of the way.