Printing issue: consistent pattern to deformation in layers

[curious aardvark]

what printer is it ?

Try and bear in mind that we are NOT in your workshop and have absolutely no idea what you've got or what you've done with it.

Then starting from that basis - give us as much information as you can.

Looks like z banding to me and at a rough guess I'd say it's probably an i3 ?

But ACTUAL information is always going to be better than us having to guess :-)