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At 15mm/s, it looks like the underextrusion is about half the size.
https://imgur.com/a/F0sXBvJ
Interesting, that would confirm the pressure advance as the likely culprit (speed and acceleration are taken into account in the algo). Maybe your slicer has a bug related to this? If changing the value wildly does not improve or worsen it, then it might not be calculating what it's supposed to. Can you try another slicer?
I turned pressure advance to 0 in both Orca and Klipper, and saw no difference. :(
I used an older Cura that I already had installed (instead of Orca 2 that I've been using) and the underextrusion pattern is different, but still there.
If you're slowing down significantly and seeing an improvement, I wonder if it's an adhesion issue vs an extrusion issue. It is very weird that it's so localized though. I almost wonder if the nozzle might be influencing things somehow. Is it clean? Get it up to temp and give it a wipe with a folded over paper towel.
I've cleaned the bed and not applied 3DLAC, and it hasn't helped.
That's disappointing. I'm sorry to say, but I'm out of ideas. Maybe try the Voron design forums since they have more active users?
Yeah, it's pretty weird. I appreciate the help, though!
I'll probably post over there soon. I'm a little burnt out by it at the moment.
I completely understand that. I'm fighting my own battles with getting a consistently perfect first layer. I've been fiddling away for a while now and for whatever reason my last print had extrusion stop about 2/3 way through. Heated the nozzle up this morning, told klipper to extrude, and it extruder perfectly happily. No console errors from the print and klipper thinks it completed successfully.
When I've had something like that (or just underextrusion randomly part way through a print) I've decided it was a clog and did a "cold pull" on the filament to fix it and it seemed to work. It can be insidious because it sometimes clog and sometimes doesn't.
Though, I've also had people suggest it was "heat creep" where the heat gets too far upwards and melts the filament too early.
I'm planning on swapping nozzles soon, might as well do a pull or three just to be sure. I wonder how that will work on my Rapido though.. it seems to melt all the filament in it and it all just oozes out by the time it gets cold. 9 times out of 10 I can flip the latch on the CW2 open and just pull the filament out of the reverse boden cold.
Whatever happened happened, I'm much more bothered by my inability to get a consistent first layer. Each new thing I try also sets me back some while I tune. The joys of tinkering with your printer and wanting to get it just so. It's already miles better than my old i3 clone ever was but the possibility of near perfection is too enticing.
What are you using for a probe? I've guessing the first layer problem is something subtle to do with your probe. If it's a Tap, it's probably filament on the nozzle and you'll need to clean it before each print.
Klickey, but I still make sure to give the nozzle a wipe before homing z on my end stop. I think I realized what my most recent goof was: I (finally) enabled bed mesh, but was using a different ze opoint than my calibrate_z macro. Calibrate_z was more consistent than just my z end stop, but it was ever so slightly out of plane. I will be making another attempt today to see if that was it.
I tried a never-used nozzle with no difference.
The bed hasn't been cleaned in a while, but the parts that aren't underextruded stick very hard. And it happens the same in every place on the bed (I've tried about 8 now, always with the same pattern) and 2 different beds.
I'm still thinking it's a pressure issue, where it initially doesn't have enough pressure for some reason. But I turned up the KAMP purge flow and it made no difference, and extruding 2 skirt lines made no difference that I could tell.
My next step is going to give the bed a good cleaning... And even try the other side that I'm pretty sure I've never used yet.