3DR - Filament spool platform

It rotates smoothly to allow filament going into the bowden extruder. Fully compatible with all kind of spools just changing the printed cylinder or even not using it.

BOM:
- printed platform part (of course)
- 1 x 10cm M8 threaded rod
- 1 x 608ZZ bearing
- 2 x M8 bolts (1 inside RIchRap 3DR top boss)
- 4 x M8 washers (optionaly you can use the printed one)