They shouldn't be visible at all (sometimes this is called "the z seam" even though it's probably not Z movement that causes it but just that's where the outer shell starts and ends). You could try printing a bit slower and cooler (play with this in tune settings - try 50% and 25% print speeds for a few layers just to see what happens and 10C and 20C cooler just to see what happens for a few layers).
This line might be caused by speed changes. Make all the speeds visible and make sure all the shell speeds are the same. The transition speed from inner shell to outer shell might be causing this. Do you have at least 2 shells? (maybe they call it wall now and not shell in cura).
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yellowshark 153
what did you set in Cura for your seam positioning?
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