Started getting these lines at the start and stop of the scarf joint. It happens on Polymaker PLA filament and BBL Basic PLA. Happens on my P1S and both X1C’s. Also seems to be some layer issues when the printed area changes from one layer to the next, like going from a flat to a thin wall. Anyone seen something similar? Much appreciated!
You might try printing outside walls first and see if that helps.
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For Scarf joints the inner/outer/inner is suggested, but I get these without scarf joints too. Happens when there is a change.