I had about 4 of the Dewalt boxes floating around my toolbox with various 1/4" hex bits, nutdrivers, drill bits, etc. I wanted to consolidate them down to one unit.

This holds 148 bits total, with 12 being your longer or heavier ones. On the underside, there are pockets to hold 4 magnets with M3 heat-set inserts and countersunk screws.

I printed mine with a 0.4mm nozzle, 15% gyroidal infill, 0.2mm layer height. Took about 30 hours and 200g of filament. At 15%, it's very stout, you're not going to break it.

The magnets I used:
https://www.amazon.com/gp/product/B07VCK8BTG/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1