potateCircles less circle-y
NatanoxHoly shit, that looks like a perfectly miscalibrated resonance compensation (Input Shaping). Can you recalibrate that?
Alternatively perhaps the belts are too tight or too loose.
I checked belts, they’re good.
I’m wondering if there is enough of a weight difference between the old and new extruder to have fouled the configuration.
Yup, changing out your extruder, even if to an identical one, changes the weight just enough to cause this. Input Shaping is indeed what you want to look for, it’ll be different depending on the printer. Some you have to adjust config files, some you can actually do in the slicer now.
I’d give OrcaSlicer a shot, it has some built-in tuning mechanisms