First rule of PETG-club is “dry your filament”, second rule of PETG-club is “dry your filament”… Thrid rule? Nope, it’s “store your filament dry”
Jokes aside, other things you could look at:
nozzle, how worn is it?
calibration tests: did you do a temp tower? Calibration cube? Retraction test?
The vertical surface doesn’t necessarily have that appearance as a result of wet filament. In my experience, wet PETG will result in more random variations than that. It looks too regular IMHO, is everything that should be tightened actually tightened?
First rule of PETG-club is “dry your filament”, second rule of PETG-club is “dry your filament”… Thrid rule? Nope, it’s “store your filament dry”
Jokes aside, other things you could look at: