As I did not like the way all the other filament boxes handled the spools, I've created my own way. Now all filament spools have their own holder (Abroller) eacht with c608zz bearing inside. So all spools can roll independently. So you need the c608zz bearings and an 8mm (eg. wood) round bar. The Filament_Box_Halter is for the ends, as the wood bar sags from the weight I also made Filament_Box_ZwischenHalter and put it in the middle of the box to support the wood bar.

Additionally I used this: https://www.thingiverse.com/thing:1371130 and https://www.thingiverse.com/thing:3038629 The second I use to feed the filament to the printer, the first to plug the tube back into the box to get it airtight (I alway leave 5cm filament standing out the tube, so I can easily replug it into the printer again). To close the filament opening for the tube I use, I use the Filemant_Box_Stopsel.stl.