A nice stackable desktop sticky notes dispenser case. It fits a block of 76mm × 76mm (3in × 3in) sticky notes, such as 3M Post-it notes.

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 Caution Opaque Yellow HTPLA.