Prusa MMU2 selector and filament path improvements
Description
The filament kept getting stuck so I did some iterative research for a new path for the filament through the selector. This replaces the PFTE front, the selector and the blade holder. The path has better funnels to direct a twisted or curved filament, and a closer distance between the PFTE front and the selector. I also recomend to remove burrs and strings with a small drill. The blade is deeper and more agressive against the PFTE front, but since it's not currently used by the firmware it's not really important to mount the blade, it seems. License is inherited from the Prusa github.
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