After a lot of printing, the knurled wheel in the material feeder can accumulate small plastic particles. The knurled wheel can easily be taken out and cleaned in the following way.
- Remove the filament from the Ultimaker Original+
- Open up the feeder by loosening the lever and pulling out the black plastic part
- Remove the feeder bolt clip (the black clip that keeps the knurled wheel in place)
- Take out the extruder gear with the knurled wheel attached to it and simply remove the dust by blowing some air against it or using a brush
- To re-assemble the knurled wheel, reverse the previous steps
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