Edit: It was the extruder. One of the belt gears sheared off, and there was enough friction between the pieces that it still worked at slower speed, even well enough for the calibration test prints I tried. I had spares that I printed ages ago and now it works.
I started getting this weird exterior wall defect that I haven’t seen before. Calibration testers come out clean though and it’s driving me insane.
Using orca slicer with an e3 switchwire trying to print parts for my other printer so I can rebuild this one into something not a switchwire.
I’m taking a complete shot in the dark, but it’s happening on the X and Y axes and what looks like similar spots every layer, which makes me think that’d it be something mechanical that’s only manifesting under some condition (like flow rate or speed). Maybe check your bolts, belts, and rails? My gut says loose toolhead/ extruder (wiggling could cause weird lines like that), but that’s more a guess than an “I’ve seen this before” kind of thing. Failing that, I’d be curious to see if that pattern shows up in a flow rate test.
I know many folks have sworn off Discord, but if you haven’t, maybe try asking in the Voron discord too?
Woo! Congrats on pinning down the source!