I created and optimized Gridfinity bins to help organize anything from screws to accessories.  I've tried to account for the most commonly needed sizes and have bins sized from 1x1 to 1x4.  There are bins with finger scoops for screws as well as 2x2 and 2x3 bins for larger items.

The bins have holes for 8mm magnets in the bottom and the print profile has been optimized to print without supports, brim, or raft.