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Best I can tell, my z-seam after a hop is under extruding? I tried looking at all3dp's troubleshooting page, but couldn't find this specific issue. Can someone fill me in on the name of this so I can best Google it? I'd also be happy to take pointers, but I do try to be self sufficient.
Hard to tell, but obviously your printer is struggling on layer change and/or retraction. Assuming its not play in your mechanism, Id fitst try printing just that part of the model without retraction and see is the problem gone. If it is, maybe you have too high retraction distance that can cause partial clogs. If the problem persist maybe you are overextruding a bit and then nozzle drags that corner out of the position. Tiny overextrusion can be a pain when printing "walls only" models. Its more guessing than anything, it would be useful to see your calibration models
I think you might be on to something with retraction. The open cubes didn't show it with the solid corner. I'll be able to print another test print tomorrow once the second copy of this print is done. I'll make a smaller cup tomorrow.
One question, when I manually feed the PETG into the 0.8 nozzle, the filament feels... Gummy? Springy? Not at all like when I've typically fed PLA into 0.4mm. I wonder if the springyness is leading to weird retraction
PLA is much harder and more brittle. Also PETG loves moisture and printers hate wet PETG, just saying
Also more info about printer and settings. Are you using preassure advance or coasting? Temps, speed, retraction settings