Vertical ripples/horizontal lines/Z-banding

Hi everyone. I'm currently reprinting some parts of my VC4 using eSUN PA6-CF with a SiC nozzle.

I have some strange horizontal lines (vertical ripples). See picture. The peak distance is around 1mm. The lines are going around the complete part, so it's not an X or Y layer shift.

For me it looks like the flow for the outer perimeter is changing with height. (which cannot be IMHO)

I have redone PID for hotend, flow and PA is calibrated.

A calibration cube does not show those lines.

Any ideas what else to check or where the problem can be found?
PXL_20241110_124736395.jpg
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