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I installed the hot end again and I am printing a 3DBenchy.

But I hear the extruder pop, as if airt bubbels are escaping during extruding.

I also see it in the print. The printes lines are not nice and flat.

I already have 3 nozzles and the same happens with 2. So this must be something else...

Retraction is at 1mm, temp at 235° and bed at 60° (PLA)