It is an Ultimaker 3
I have 3 of those, all more or less the same problem, after trying around I will try to get a different brand of filament ….
I spend a lot of time cleaning, and calibrating,
and because all 3 printers give(almost) the same result with the same settings, I’m excluding a setting (for now)
they all run on the same most recent stable firmware, and have the exact same file, leading to the exact same result, with the exact same material, ordered on the same time, so I’m now going to try to exclude the materials from the problem, to see if it stays consistent …..
thanks for the tips! I let you know when i switched it…