Magnetic bit holder, models from 4 to 15 bits (2x2 to 3x5).

Uses 6x2mm magnets on both sides, back sides have enough holes, install as many magnets as you need. Holes have taper, so there should not be need for glue. 6mm hex is pretty handy when installing magnets to the bit holes. Polarity is important on the back side, so don't flip the magnets after taking from the stack.

Print profiles are painted and ready to go, just choose the same filament for both areas if you want it in single color. 

If you are not using the profiles be sure to arrange seams to back and orient the stl correctly so the seams print to the corners of the hexagons. 0.20mm and 2 walls works well. No supports.