Spool shelf spool holder for the Prusa mmu

This is a spool holder that can be used when you have a shelf with bars. I used bearing and the metal bar from the original Prusa mmu1 spool holders.  I have also added a connection for the original mmu3 spool buffer/idler as shown in photos. The path to the mmu3 is now much shorter in my case and I didn't had issues since with mmu3.

I printed the parts with 15% infill and with a PETG filament.