Meanwhile, I completed some tweaking. I calibrated the E value in M92 again and set it from 231 to 243. I also set the K value to 0.08 (as it is suggested in many threads). Finally, I did a 5x5 auto calibration which showed a quite reasonable result to mine opinion.
Just the front row a partly the back row of the printed squares are not good. This might even by due to the irregular bed heating. Temperature, especially in the front row is about 15 °C lower than in the center.
I’ll do some more test prints and see how the improvement is.
One more thing, In this thread
I don’t know if I got that right in the part about the extruder calibration multiplier. I printed the test cube a measured wall thickness. It was 1.6 mm. Setting in Luban is 1.2 mm. So, is it correct to set flow within the material menu to 75%?
I’m not quite sure what is meant with “Adjust your extrusion multiplier”…