This is my attempt at a simple and cheap Filament Dry box with a spool roller that doesn't need any bearings or screws.

The base was printed it no top or bottom, 0% infill and 3 walls. 

The width can be easily scaled on the slicer to fit other boxes or spools and can be taped to the bottom to fix it but I didn't find that necessary.

All you need to assemble the base is a small length of ptfe or bowden tube.

The top cap is for 65mm openings and I used silicone to attach it (Hot glue should work too).

I recommend using my PTFE Tube Cap with this.