Artefacts on walls
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I can think of three likely causes of artefacts like that, that go all the way across the face (not just at the leading edge, which is symptomatic of ringing):
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Belt issues. If that's the case then the pitch will be related to the belt tooth pitch and will not vary with layer height or extrusion width. A possible cause is the use of smooth idlers instead of toothed ones.
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Motor issues (least likely). In this case the pitch of the artefacts will be a multiple of full motor steps, most likely it will be 1, 2 or 4 full steps.
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Extruder issues. In this case then the pitch will decrease if you increase layer height or extrusion width. A possible cause is the use of an ungeared extruder with low steps/mm. Remedies include increasing extruder microstepping, changing from a 1.8deg to a 0.9deg motor, or changing to a geared extruder.
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