Filament Spool Holder with 608 Bearings for Prusa XL

I like my Prusa XL tool changer but don't care for the spool holders they included. This is a remix of @hugoG_253127's “Filler” filament holder to work with the hardware provided with the XL.

By using 608 ball bearings, friction is significantly reduced. 

Mounts into the 3030 extrusions the same way the original spool holders do, using the M4x12 screws and the M4nEs nuts Prusa provides.

For each spool, print one Roller and one XL Mount. No supports needed for the XL Mount. The Roller is printed standing up and needs some supports at the base. 

Each Roller requires two 608 ball bearings, e.g., https://www.amazon.com/Skateboard-Bearings-Double-Shielded-Silver/dp/B002BBGTK6

STEP file included.

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Changed mount point to work with the Prusa XL. Added chamfer to base.