This design uses up to 20 6x2mm magnets, but you can use as few as you desire. They slip into place easily and can be removed with a pick. I made this compatible with a gridfinity “rugged” box for storage. When stacked with other bins, or stored in a gridfinity box, all the bits and the driver are retained. 

No special print settings are required, but I recommend ensuring your slicer properly generates the bridges for this model, they must be perpendicular to the slot for removing the magnet. Like this; 

If it is not printed like this, the magnets will not fit. I had this issue on my first test print. In OrcaSlicer, I fixed this issue by setting “Bridge counterbore holes” to “Partially bridged.”

I printed my model in Sunlu PLA High Speed at 220c, with a max volumetric speed of 21mm^3/s. 

I'm not sure exactly what drivers will fit in this holder, so I included a dimensioned drawing so you can check for proper fitment. 

Good luck and happy printing!