You're not doing anything wrong. These scratches are what Cura does when it calculates "head travel" (blue lines in Cura's layer view).
Maybe there's some way to avoid it, but this is the "standard" with Cura.
If you want to call it that, this is an error from Cura. Nothing wrong with the machine calibration or adjustments...
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kaybie 0
Hi Tobias,
I am new to the Ultimaker also, so I could be wrong - but this sounds like an issue I have had before.
Have you tried to disable combing? This can be found in the Expert Settings of Cura.
It has also been suggested to me to use a plugin called RetractWhileCombing if you do not wish to disable combing.
Hope that helps.
Kaybie
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