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