Robo3D R1 Filament Spool Holder

This is a remix of the [Robo3d filament holder](https://www.thingiverse.com/thing:341993) by [Noudje](https://www.thingiverse.com/Noudje/about). It has been modified to clip firmly on just one side of the printer shroud and to use standard [608 skateboard bearings](https://www.amazon.com/s?field-keywords=608+bearings) with no fasteners required. The wheels are remixed from the [Robo3d Filament spool holder](https://www.thingiverse.com/thing:1093502) by [jeh241_makestuff](https://www.thingiverse.