In my printer began to appear clear horizontal lines on prints. This thing occurs in the back of the printout (no matter how I rotate the object in the sliser). I have tried everything, adjusting the belt, loosening the screws on z-rod, cleaning and lubricating the whole printer (superlube oil), tightening the screws from the motor mount, slowing down the print, etc. I do not know what can affect the appearance of these lines only on the back of the print (in the back of the bed). Any ideas?
Checked that the bed screws under the buildplate are tight? Mine have come loose before affecting the print. Are the linear rod carriages without wobble? In other words is there play one the build plate, can it rock?
The screws under the plate are tightened, when trying to move the bed sideways it has play.
Take off the bed and check the screws that attach the bed carriage to the linear rods also check if those parts rattle on the rods. I ended up replacing them with MGN12 linear rails but hopefully your rods aren’t loose.