Banding / striping z axis

vintagepork

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 ![alt text](image url)
Pic has filler to highlight the issue.

Room is steady temp

Latest cura. Super quality.