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3DPrinting
3DPrinting is a place where makers of all skill levels and walks of life can learn about and discuss 3D printing and development of 3D printed parts and devices.
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I've seen bad wheels, misaligned wheels, or failing wheel bearings create these kinds of cyclic patterns as the angle of the wheel where the problem occurs introduces inaccuracy that adds up over time.
I don't know how helpful I can be from a diagnostics perspective because I'm not familiar with this specific printer, but I would suggest checking that your wheels are secure and true and ensure that your rails are unobstructed.