Banding / striping z axis
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Hi can someone help me with an issue please . Two weeks old. First printer etc.
Printed the dog. And all perfect, out of the box.
But now I get banding on z axis (fairly uniform in height).How do I go about fixing ? Use ing tianse white pla marlin 1.0.1
I did adjust the rollers to fix a squeak. 1/4 turn, but even if I put it back. Still get this banding. Much worse on cylinders 
Pic has filler to highlight the issue.
Room is steady tempLatest cura. Super quality.