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I use an UM2. I am at my wits' end.

It started with warping but only at corners in the left/back quadrant. I adjusted and re-calibrated, I rotated my model to avoid that area and also chose one that had brims around the corners. Additionally, I loosened the spooled PLA to make sure the feeder wouldn't click. I'm not sure my measures were successful but now I observed something even weirder: one spot were underextrusion happens 5a33409ad3cad_Photo-2017-11-06-13-57-19_2017-11-0613-42-040100_2.thumb.jpg.9ef988ed3827ff0ac59a470a46fc7ade.jpg.

The surface is evenly cleaned, it doesn't look or feel different at that spot. How can this happen?

5a33409ad3cad_Photo-2017-11-06-13-57-19_2017-11-0613-42-040100_2.thumb.jpg.9ef988ed3827ff0ac59a470a46fc7ade.jpg

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