The case fits into Zack Freedman's Gridfinity system using a custom design inspired by @grizzie17's Gridfinity Refined and @rekk's Gridfinity Refried. You can push 6x2mm magnets in the nice press-fit magnet slots, or use a thumbscrew for a more permanent attachment. The thumbscrews printed from @grizzie17's files will fit this model, too.

Printing Recommendations

This prints fine without supports or brims.

The sample model in the photos was printed in Protopasta Sun Gold Metallic Yellow HTPLA