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Hmm. So, how...cyclic is the pattern? is the height between sections the same? I'm wondering if your lead screw isn't straight- as it turns, the lack of straightness causes the z axis to bend and flex back and forth a bit. small perturbations at low-z-heights would tend to grow kinda like that.
But I'm not entirely confident in this answer and we'll probably need more information like materials, temperature setting, layer thickness and part cooling settings, as well as sped settings.