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Strange Loops of the filament

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I have in the print such loops or bows of the filament.

ABS, 260°C, bed 90°C, speed 40mm/sec.

I changed speed, but my impression this is not changing.

I am using this filament in another machine with no problems like this.


Has anyone in an idea, what I could test?

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I tried with Cura - it looks quite different.the stripes change postion with the speed. if you move the nozzle head (UM2, of course power off) do you feel any resistances? If I move the head, I feel not the same resistance over the movement.


With Cura I have the issue that the perimeter goes sometimes outside the model. It is reproducable, it is always on the same points- but not visible in Cura.


Any ideas ...??




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