This is an etui for 10 filament swatches. It has a place for paper label of size 38.1 x 21.2 mm. Suitable swatches are
https://www.prusaprinters.org/prints/31380-filament-swatch-with-a-note-area
Use placeholder washer in case you don't have 10 swatches ready.
Use M4 bolt with a nut.
Model updated to Etui_v2.stl
Find more info at
https://www.yirco.me/etui-for-filament-swatches/
Print it with almost any material except flexible. I recommend PETG or PLA.
30% infil
3 perimeters
The author hasn't provided the model origin yet.