3DPrinting
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That retract distance seems a bit low to me. My (direct drive) printer is happier around 1mm to 1.5mm. I'm not convinced that has anything to do with your particular problem, though.
Anyhow, to my untrained eye that looks like underextrusion at layer change and/or the perimeter lines not actually hitting each other. Are you sure your pressure advance/linear advance values are correct for that filament?
Also, does Orca Slicer allow you to specify a negative value for the seam gap? If so, that might be worth fooling with to see if it has any impact. That's probably a band-aid, though. I think your issue lies in pressure advance tuning still.
This is the filament I've tuned PA with, and to my best ability this is what Elli's guide suggests is the optimal value 🤷♂️
But I agree, it does actually look like PA is tuned incorrectly and stopping extrusion too soon/starting it too late.
Try without PA, also try another filament
Also try normal brass nozzle and check if your new hotend is not loose
Tried without PA but there was no difference, going to try different filament next.
As I mentioned somewhere else in this post, it seems to relate to the infill. I'm using gyroid, and the seam lines up with the anchor point for the infill.
You can also try without infill 😉
Im throwing many things to try, but not in any particular order