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Based on feedback it is now recommended to print at .1mm layer height to reduce the chance of filament catching on any thick layer lines.
Added kmccon's front PTFE holder.
This is a direct remix of kmccon's work found here.
You will need front PTFE for this to work properly.
I made the inlet for the selector much larger and smooth to deal with filament that just didn't want to behave. Works great. No more selector jams.