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Weird z axis behavior

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Posted · Weird z axis behavior

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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Posted · Weird z axis behavior

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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Posted · Weird z axis behavior

The problem was dust on the filament. The problem manifested in horizontal lines, that seemed regular. Probably the dust on the filament was so thick, the clogs happened at regular intervals.

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