1.5" x 1.5" (38x38mm) cardboard coin flip storage box and a lid

It's super simple.  I originally designed a simple box with a lid for storing pencils, pens, and paintbrushes.  https://www.printables.com/model/619803-simple-storage-box-with-lid-for-paintbrush-pen-pen  I was looking for a small storage box for 1.5" x 1.5" size coin flips (38x38 mm).

This is just my pencil box, sized just right for the coin flips I had.  If you also like 1.5" coin flips, maybe you will also like this box.  The lid is just friction fit.  Nothing fancy.

It fits great on a standard-sized (ender3) bed.  If you have a 180mm bed, you might need to orient it diagonally.  I printed it just with 2 perimeters.  It doesn't require a bunch of filament.  I printed with a 0.6mm nozzle and 0.4mm layer height for speed.