The diameter of the material is 2,9mm so i would think that isn't the problem.
Next to that, I also had a roll of blue from the same brand which worked perfectly, untill now where it gave the same problem.
I switched to yellow to see if there was any difference but alas.
Have you measured the filament diameter? I had similar results yesterday with some filament that was up in the 2.9+mm size. It causes variable friction in the mechanism.
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