i would try some basic models, like a cylinder or cube, just one wall no infill, no top, nor bottom, just one wall.
A cylinder would be the best thing, as it doesn’t cause vibrations as much as a cube would, also trying different diameters of such cylinder, to see when the problem becomes more visible.
Checking the nozzle would be not a bad idea as well, or even swapping it.
Brass nozzle gives me the best results, as it can easily keep the temperature constant.
Bad flow ratio due to the extruder slipping while pulling on the filament?
I would try extreme values on the flow, like 0,7 and 1,4 to see what happens.
On the bottom(?) of the print you present in the picture, the surface is rather smooth, could be also some Z axis wobble, however, this should not occur with lower speed.
That being said, does the model in the slicer has smooth walls?
Have you tried different slicer software? like Orca slicer? which is 99% same as creality print software.
i would run some tests while changing the wall generator setting, and also wall printing order may be useful.
Might wanna check also this here:
switching to flow preview, layer height /width to see if the slicer shows it on the model. Maybe some settings are not quite right and the printer is actually executing it accordingly to the settings?
It would also definitely help if you add some basic information, for example what kind of filament, nozzle temperature, flow rate, and volumetric speed, also cooling.
One last question, does only the wall with the seam experience such problem?
