Thanks so much for the reply!
Unfortunately it's not only the first layer. It's all the way through. The last two images are the topmost layer. And watching it print, I can see this issue occuring on every layer right the way through, in the same places on each layer. Note the artifact appears in the layers on the closest corner in images 3&4.
It's definitely not a leveling issue, when I live level the whole bed with a huge brim on a cube it doesn't appear. It doesn't appear on any brims, actually, no matter how wide. Or bridges. Only fill and perimeters. I know leveling can cause a similar effect, but if you zoom in on image 1 you can see it's not squishing the filament, it's simply not extruding it. This is evidenced in the little drippy line that appears instead of a smudgy one from a too-close bed.
And yea, it happens on every layer, so not leveling I'm afraid. :(
The extruder gears seem in good repair on both of the machines I'm working on.
:(
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gr5 2,295
It looks like the problem is only on the bottom layer. The bottom layer is extremely sensitive to "leveling" or how close the nozzle is to the bed when printing the bottom layer.
It looks to me like your extruder is slipping occasionally and that is probably because you are just a little too close to the bed. Or maybe your extruder is a bit weak. Or the teeth in the extruder are a bit weak and the filament slips backwards occasionally.
As a test, hold the filament while it is printing the bottom layer and feel for it moving backwards suddenly followed by these underextrusion spots on the bottom layer. The fix might be to level about 0.05mm farther from the bed. yes, one half of one tenth of one mm. 0.05mm. That might be enough.
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