Two trees bluer filament guide
thingiverse
To prevent damaging the filament runout sensor's entrance due to friction, simply unscrew the two little screws on top of the sensor, remove the two separator pieces below it and replace them with this piece. Then, insert the two screws again. If desired, you can add a piece of PTFE tube into the new piece but it is not necessary as it will work just fine without it.
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