M Prime One spool holder (alpha)

This is an experimental design of the M Prime One spool holder, an alpha version that we use to hold the filament spool on top of our 3D printers. It's still far from a final version, it needs a redesign, but at least is a working spool holder that you can build and improve. It's compatible with both wide and narrow filament spools, and although it is attached to the top of the printer it doesn't make it unstable. It fits in a 8mm M Prime One frame. You should modify the design if you want to us