Thank you for the answer.
I have the latest (as from last week) Ultimaker, so I assume it comes with the latests dive filament. I'll try to tighten a little bit and print at 200-220.
Most of the times the walls are pretty smooth. What surprises me, is that the mistake always happens in the same area.
I'd say there's not enough plastic coming from your nozzle.
What filament drive mechanism do you have? Maybe it slips. have you tried tightening it?
I think your temperature is rather high, most values I see here in this forum are between 200 and 220.
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