JohnMatthews72

It might be to do with layer heights. I have removed fine inconsistencies with stacks by ensuring that I am using layer heights that are multiples of 0.04mm. This is because the Z axis servos hold better when asked to lock into steps of this size. (Yes, microsteps work, but are less reliable than full steps. If you are printing at a layer height of say... 0.15mm, try going up to 0.16 mm. If you are printing at 0.25mm, try coming down to 0.24mm. Because of the modulus of your print errors, I'd suggest this may be the case.