On a small calibration cube this is often caused by the middle layers being printed at a different speed due to Cooling > Minimum Layer Time. You can look at this for yourself in Preview mode by setting Color Scheme > Line Type to Speed:
If you set Cooling > Minimum Layer Time in the print quality settings to something low like 1 second then none of the layers will be quick enough that they get slowed down.
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Dustin 178
You will likely get better help with your issue in a community dedicated to your 3d printer in question.
This is the UltiMaker Community.. and while many people here use different printers.
Its not really the best place for focused support for your specific issue.
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