Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:2780611.

Use support only for the side filament guide, not necessary for the spool holder (print on the side). Use "touching bed" supoport only, not "everywhere" otherwise the cylinder will be filled ... Print 0.2 for the spool holder and 0.1 for the filament guide. I am using this https://www.thingiverse.com/thing:992975 for the right spool support adapter (10mm)

UPDATE : i redesign the spool holder to lower the filament, more easy to manage space and the filament is at the same level as the entry of bowden.