This is a box I designed for my filament swatches. It's not as fancy as the other ones available, but I tried to eliminate ‘dead space’. I use flat swatches, and the file I use is this one: https://www.printables.com/model/392030-filament-swatch-v2-flat

The swatches I use are 102mm x 45mm

The gap between the outside of the base, and inside of the lid is .3mm, so please make sure your printer is calibrated enough to print that tolerance for proper fitment.

I've set the profile up as the standard default .2mm profile, with .4mm nozzle and textured PEI sheet. I've turned off the auto brim which is enabled in that profile. I've selected the generic PLA for the 2 filaments.

For swatches to put in this box, check out my collection of pattern swatches: https://makerworld.com/en/u/4256451819/collections/130890

The filaments I've used are:

Inland Marble PLA

Inland White PLA+