This box holds filament sample cards that are 80 mm x 35 mm x 2.2 mm. I use 80x35x2 filament cards but like the extra room to be able to more easily add and remove the sample cards.

I included both a 40 card holder and 4 card holder so can print smaller sample box first if want to test sizing.

Here are the filament cards that work with this box. https://makerworld.com/en/models/491156#profileId-404647

Here is the 50 card holder if have A1, P1P, P1S, or X1C. Will not fit on A1 Mini. https://makerworld.com/en/models/491195#profileId-404686

This box was created using SCAD files provided by https://makerworld.com/en/models/47208. Go give them a boost if you enjoy this as I have.