Spool Box - Storage for Filament

My intention was to find a possibility to store my spools in an easy and good way with only little airflow but quick access.
So I designed the spool-box. You can put several boxes next to each other. At the moment I use 7 of them.
First I had only PLA from one brand. When I bought another one I realized, that the spools differ in height and I had to change the size. If you want to be sure that the box fits to your spool, I recommend you to look at the FreeCAD-file and perhaps to change the size.
It takes about 240g of PLA, depending on infill.