With this holder you can make screwdriver from 1/4" hex bits.

Shape is simple to print also for redesign. There are limited circles, elipses.
From bottom part there is slot for bit. From top part there is hole for neodymium magnet, e.g. if you want to stick screwdriver on magnetic table.

Sometimes the adjusting of print size can be needed, if you want to have some inserting pressure for bits. If holder is little bigger, the bits can fall away.

I printed it from PLA, with heated bed. Printing is started from bit hole, up to higher levels.