My spin on the hexagonal dice boxes I had seen out there. I wanted one that fit together without a large seam, held in magnets without glue, and indicated the top of the box when putting the lid back on.

No special printing instructions are required. I prefer 3 walls with 25% infill density, but 2 walls with 20% density should also work fine. I install two sets of magnets in one orientation, and the third in the other orientation to help keep the magnets from closing the lid in a way that doesn't line up. I recommend installing the magnets into one side first, then putting magnets on the installed magnets, and then pressing the other side onto the magnets to press them together so that the magnets are in the correct orientation. Then seat them with a pair of pliers or your fingers so they are flush with the surface.

I've also included two SVGs of a D20 if you want to print the version from the photos.

Takes 3 EA - 6x3mm magnets that you press fit in