So at first I was like - "wow that's smaller than I expected" and also "Nope - looks fine - my machine doesn't do this".
Also by the way I rarely use PVA lately (I like breakaway) and it's been about a year since I used it and my PVA got "wet" despite being in a sealed bag with lots of dessicant. It needs to be dried but that doesn't matter because the PVA isn't the issue. By the way you set "support horizontal expansion" to zero. It defaults to 3 for a good reason - this brings the support down to the print bed and makes it MUCH less likely to fail. but your print didn't fail so whatever.
As you can see it recovered.
So then I took a more careful picture (and looked with some magnifying glasses) and I could see - my printer does indeed do it. Also I noticed that on the upper layers it was 3 seconds per layer per tower. 3 seconds!!!! This is important.
Anyway so my printer does do it as you can see:
I'm not sure if it is as bad as yours or about the same??
Anyway - it could be partly Z axis but I think it's temperature. At 3 seconds - that's not really enough for the print head to come all the way back to the eariler temperature and as it does the second layer (it does 2 in a row in the PVA section) it's now warmer - it has had 3 more seconds to heat up. So that's what I think it is.
To prove it do a 30mm cube (instead of 10mm) and make sure there is at least 30% infill to let the nozzle heat up to proper temperature before printing the outer walls.
ALSO - I didn't realize how subtle the issue is! I can't even see it without reading glasses. Plus I have to twist it in the light just so (which everyone naturally does when inspecting something but if no one is really looking for defects they are unlikely to notice this).
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JD-Art
okay that was a lot of posted i'll see if i can get all the comments correct 😉 I know about the support expansion and most the times i also print with it. but for this test it was
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gr5 2,235
I just printed it. Wow. Yeah mine does it also. Okay so...
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