SV06 ugly layer lines

Try using prusaslicer, i was having exactly the same issue with cura, i switched to prusa slicer using the mk3s profile and no problem any more!

I have the same problem.

One of the screw rods is bend but the sovol-support does not respond.

print

look at this: Extrusion Quality - Mystery issue resolved ! - YouTube

my extruder gears are bad and this video gave me the answer why!