Filament Roller for Prusa MMU2

I designed this filament roller combining the features I liked from two things: [Peter Rasmussen's](https://www.thingiverse.com/Rasmussen/about) [Prusament Filament Holder](https://www.thingiverse.com/thing:3197940) and [Paul Meyer's](https://www.thingiverse.com/pmeyer/about) [Prusa Research MMU2 improved roller](https://www.thingiverse.com/thing:3113520). I reuse a couple of STL files from the second thing, while using the first thing as inspiration. As described in the second thing, this signi