I designed this bit holder for my Hitachi DV 18DBEL driver.

It uses one D.5 x 2mm cylindrical neodymium magnet to hold two bits in place. The bits hold perfectly in place but are very easy to take and put back in the holder (no friction, only the magnet).

The design is very streamlined and integrated to this drill, but the general holding system could fit any other with some modifications.

Easy print in PETG or PLA