Modular snap track filiment spool storage

Got a filament spool containment issue? Don't want to drill holes in your walls have to go to the hardware store? Well this storage system is for you! These tracks will store a minimum of 2 rolls vertically and a maximum up to infinity. 1 male end and 1 female end. Print as many middle sections as your heart desires. Need more in the future? just print another middle section and expand as you go. Each section is 70mm wide for a standard 1Kg spool. No supports needed.

The math goes as such. 

Two Rolls = 1 male , 1 female 

Three rolls = 1 male, 1 middle, 1 female

Four rolls = 1 male, 2 middle, 1 female

So on on and so forth.

1000 rolls = 1 male 998 middle 1 female.

I have included a small tolerance into the snaps. Should work well for everyone. if not. let me know.