In my Prusa, I mounted filament spool on top of frame perpendicular to X axis which caused entanglement and damage. This is guide fixes that.
- push 'top.stl' into 'middle.stl' and 'middle.stl' into 'bottom.stl'
- screw onto frame
- if not very stable, print two 'support.stl's and screw them to bottom part