I have trouble fixing the terrible seams I'm getting. I've followed Elli's print tuning guide and calibrated extruder, tuned PA (it's now 0.035) and extrusion multiplier.
I've tried adjusting both retraction length and speed, but it doesn't seem to have much impact. I'm not using "wipe on retract" or "retract on layer change", I only retract if travel distance is longer than 3mm. Retract is 0.3mm @35mm/s.
I've tried reducing PA smooth time too, but this also doesn't seem to have a noticable impact.
I've tried reducing seam gap from the default 10% in Orca all the way down to 0%, but the bad seams persist.
I've tried with "wipe on loops" both disabled and enabled with no difference.
I've tried with both arachne and classic wall generator, no difference.
I've tried different wall orders, inner/outer, inner/outer/inner and outer/inner, all with the same bad seams.
Filament in the picture is matte PLA, it is without doubt dry and generally prints well aside from the seams. It's stored vacuum sealed with silica, and I use a filament dryer to dry if I suspect wet filament.
I'm running out of ideas for where to tweak to get a decent result.
_ I’m not using .... “retract on layer change”_
There's your problem.
No, I've tried with that enabled as well, same issue. This isn't before a layer change, it's when it goes from extruding the walls to extruding the infill.
But even without infill this happens. It's the end of the outer wall that doesn't connect to the beginning of the outer wall and it's not really fixed by reducing seam gap, so I'm not sure what's actually causing it.
What slicer?
I'm using orca slicer
Then I recommend Prusa Slicer.
This is likely a slicer issue.
Just tried, prusa slicer results in the same seam issue. I just loaded the default printer profile from anycubic and only changed gcode flavour from marlin to klipper (since I'm running klipper) and left the rest at default. Looks the same.