Walls looks terrible PETG HF

[Schnappabommel]

Maybe the same issue.

PETG HF Problem after approx. half spool

Im having big Trouble with my last order of PETG HF. Unfortunately i ordered 18kg and spool after spool apears to have the same problem. Almost exactly the first half of the spool prints well. Then prints become miserable. What i see from the moment when prints starting to get ugly i also can see the filament on the spool isnt dark and full black anymore. It has this weird white/grey haze on it. Not removable. Then i put it under microscope - and i saw its not just a haze, its more like a mec…