Modular spool filament holder - dry box use

I took the idea of this model and made a modular spool holder.
When I model it, I thought about the spool holder for the possibitity to have it in a smaller plastic box and use it like a "dry box" for filament. I used standard 1kg spools, so each spool with width till 67mm will fit. 

Of course you can change the dimensions of shaft and pin to have holder wider. it is up to you.

I purchased a 32L plastic box, where the inner space is 39.5 cm. Holder for 5 spools needs 39.3 cm. So it fits perfectly. 

dimensions, number of spools, modular