My coffee machine (Moccamaster Cup One) uses a small (No.1) type of filter, I use this box to keep them.

I created 2 versions:

• V1 is shown in the photos and needs support, I did not like the print quality of this part so I created:
• V2 fills the previously empty part in the back and does not need support

I guess the model can be adapted for other sizes, but IDK if this can be done by a simple scale. The FreeCAD model is not complicated, so it should be easy enough to adapt it to different geometries.