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Hey tldr but I can tell you that the gap is the result of the z seam. Your z seam alignment is probably set to anything BUT random. If the z seam location doesn't change then it'll show up as a long vertical gap in most things. Set z seam location to random and it should sort itself out.
Cura leaves gaps in wall cylinders
in UltiMaker Cura
Posted
Hey tldr but I can tell you that the gap is the result of the z seam. Your z seam alignment is probably set to anything BUT random. If the z seam location doesn't change then it'll show up as a long vertical gap in most things. Set z seam location to random and it should sort itself out.