This one I made for use with the MMU2, because the filament I bought uses spools that are made of cardboard (a little deformed), so it was dificult to use with the spoolholder provided by Prusa. Anyway, it works fine with 30 mm diameter spools and recently I added a simple piece that allows to use spools with a higher diameter (up to 52 mm).

I recommend to use PETG for printing (at least the grapas) and 15% infill wil sufice. It is pretty easy to assemble and you won't need any aditional components or tools. No supports required.

I hope you find it useful.

P.D.: I originally posted this model on Cults3D.