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Weird z axis behavior

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So my ultimaker shows some weird behavior in z-direction. Every tenth layer it underextrudes one single layer, before printing just fine. This results in prints as seen in the picture.

It seems to be caused by the z-stage, maybe it lowers to much each step, causing the evenly distributed pattern.

Could someone please explain me what happened and how to fix the problem.tumblr_mtu8hjpt2C1sq32vqo1_500.jpg



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What? Dust in the z screw? Dust in the filament? I don't get it. I thought the pattern was regular. I guess maybe the problem doesn't show up in the photo? Or maybe the entire part was underextruded?


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