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Some layers are darker than others

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I dont know why some layers are darker than others on my printed objects.

I use white Ultimaker PLA.


The object itself is pretty smooth and the corners as well as you can see in the photos.


Maybe It is Z Wobble but I am not sure. Do you have any ideas?










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I've checked the height of the object as well and it has the height it should have. I believe it wouldn't be Z Wobble if the model has the desired height. Am I right?

From the looks of it I would say that the darker layers are under-extruded layers.


Printing slower and cooler didn't help. The printer doesn't have play on the X/Y axles as well. I'm pretty desperate right now.



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