Bobine Filament Support for Alfawise U20

A rigid support for bobine for Alfawise U20, to simply install on the top left frame.

Advantage:
- No bearing , no bolt needed
- One part only
- Very very rigid (maybe too much)
- Good alignement with the filament feed entrance

Bad points :
- Takes time to print (9h with 0.2mm layer high and 5% infill)
- For bobine with minimum Ø56mm inner diameter and max Ø200 outside diameter
- Carefull if you print part with more than 350mm of elevation