I have spent hours chasing down these weird surface blemishes
In frustration I went back to V4.1 and they disappeared so literally went item by item to figure out what setting might be causing it.. and it turns out, after hours of printing the same object with just about all the settings I could think of changing - it is when I use cubic infill, if I change infill to say rectilinear with no other change the blemishes disappear and it prints nice again!
I'm not using any crazy settings, 2 layers all over, 25% infill, and like I say if I print with V4.1 its a nice smooth finish without those weird extrusion lines that are protruding out from the surface
I need to test further but it looks like the setting "Modify travel movements to avoid open spaces" is also adding some similar blemishes but not to the same extent, I started out with them both on.
I am printing perimeters outside-in so even if the infill was going into the perimeter a bit too much it still shouldn't be making those sort of blemishes I wouldn't have thought.
Is this a bug with Cubic? I haven't tried the other new infills to see if they also do it.
The part is Thread_Test_2_x1_Rev1.STL from a voron test prints here https://github.com/VoronDesign/Voron-2/ ... est_Prints