Ive had an inconsistent issue plaguing me for weeks. Despite the printer working perfectly for months
I have cleaned and lubed all rails and the lead screw. I have tightened all bolts and belts i could easily access. I have tried multiple filaments, dried them and tried again.
I have dialled in the calibration of the filaments, adjusted the Z hop and speed settings to no avail.
Cleaning and lubing fixed most of the issues, but not the inconsistent z-ribbing. In the pictures i have included the two test towers were printed one after the other. The ribbing/banding is in different places.