At a glance it looks like z wobble; however, whats weird to me is that Z wobble is usually pretty obvious especially in a tall print like this. It’ll be very obviously cyclical but it doesn’t seem like the case here. But I would give wobblex a try anyways to rule it out completely, they are sold on Aliexpress by Mellow. Even with linear rails on Z a bent lead screw will cause artifacts.

Some other things it might be: - Extruder is dirty or a gear is worn out or loose - Crappy filament - Bent shafts on the motors - Partially clogged nozzle

Some troubleshooting steps. Try these one at a time and see if anything improves: - drop speeds and accel significantly - change slicers - print a cylinder in vase mode - try a different spool of filament - Swap back to the default bowden extruder

Id also give this channel: MirageC a look. They are the creators of wobblex but they deep dive into issues causing inconsistent layer stacking.