Prusa i3 Spool holder (yet anotherone)

Nice fitting to the prusa i3 6mm frame. There are these other parts you get off the shelf:
- 2x 608ZZ bearings (22x8x7),
- 150mm 8mm threaded rod
- 4 x M8 nuts
- 4 x M8 washers

Print 2 of each.

Side holders are nicely fitting to different sizes in spools inner radius.
The bearing fits snuggy, remove the support material. Use the washers to provide clearance for bearing.

Updates:
-support those spools with very small inner diameter (30mm).
-bracket now has a clip on leavi