Simple Spool Roller for Snapmaker 2.0

Simple similar to many others roller accessory to improve the ability of a spool to roll smoothly on a holder arm without too much 'friction' tugging against your extruder gear.

Print 4 of the spheres, 1 of the, um, assembler. You will need to source your own metal rod stock for the 'axles'. The central hole is sized for the Snapmaker 2.0 reel support arm. The spacing of the spheres is such that this fits the PLA reel I got with the SM2, and appears to fit the PETG spool I got from them too (just eyeballing them side by side, haven't tried yet). I am using it with the Enclosure on a SM2.0 A250 (middle size of the 3 models).

May not be as necessary on the Snapmaker 2.0 type system, with the print head only moving in X and Z, not Y (the table does that). But with the added enclosure and the grommet thru the side panel providing another friction and choke point, I feel much more comfortable leaving prints unattended with this added.

Sphere orientation should be obvious, t