H2D Z-Banding

[philch]

I posted about it here:

Beware of creaking noise, it might be your extruder gear failing

I suddenly had a very poor result while performing a high precision offset calibration, I had underextrusion, bad layer adhesion etc things that never happened before. The only thing I did before this was trying the 0.2 nozzles and this happened after I switched back to 0.4 nozzles. I redid the calibration and the only strange thing was some creaking sound during the flow calibration of the process that I had not noticed before, calibration failed again with same results. I checked nozzles, t…