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I've printed hundreds of prints over a few years. Now I haven't printed in a few weeks but this is the first time I've had a problem like this. This is supposed to be flat. What's happening?
Bonus video: https://drive.proton.me/urls/74XZH4FVSM#1QqSvXK3MJCF
The audio might be a clue for you to help me troubleshoot
While PETG certainly has a lot more moisture problems than PLA, PLA can still give you a lot of grief if it isn't dry enough. Stringing, oozing, uneven extrusion, and many other weird problems. I would definitely try to dry the filament...
But this could also look a bit like over/under-extrusion... Have you tried calibrating your e-steps?