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Just about all of my prints have these lines at around the same heights, and I can't figure out why. I tried changing the nozzle, changing the layer height from 0.15 to 0.12, and changing the speed from 60mm to 40mm. All of these seemed to have helped a bit, yet they remain. I was thinking maybe as the prints get to a certain height, the shaking of the bed (Prusa MK2) caused the layers to be slightly offset perhaps. Anyone have any other ideas?
Horizontal banding can be caused by a few things
If you print two different models and it happens at the same z height you can basically guarantee it's a mechanical issue. If it's more random you'll need to troubleshoot further.
Also, a moist filament.