I'm somewhat puzzled which settings I need to look at in PrusaSlicer to solve those thin slits between perimeters. I've dialed in the flowrate optimally for dimensional correctness and 245°C (PETG) works really well for both flow and overhangs.
At first I thought of extrusion width, but that also increases the distance between each line. Raising the flowrate closes them, but also makes the printed parts grow in each dimension outside if the intended size.
Where am I missing something? Which settings do I need to adjust to not screw up everything else?
EDIT: It's not just corners!
I know it's not as popular anymore, but this is why we calibrate our printers. [(https://ellis3dp.com/Print-Tuning-Guide/articles/index_tuning.html)] This is an excellent guide to getting your printer to work to near perfection if you do all the tests. But it does take time and effort to learn and do.
If you switch to Orca, they have a pretty decent calibration suite built in. It's not as rigorous as Ellis, but good enough for most things.