Thanks for the reply. I bought it last year, but it is still in the warranty.
Since this only happens at only 2 specific spots, I guess the problem is with the Z axis
This is kind of a new issue, I left it stopped for 3 moths, I guess, (covered) and this problem happened. I will try loosening the screws ( never tried this) and check if I can fix it by cleaning specific spots.
You are on the right track. These kinds of lines can be caused by many things (filament tangles, z stepper drive too hotO) but with this kind of consistency and on models of very different amounts of plastic per layer - the only explanation left is Z stage issues.
Fortunately you know how take everything apart. Start by sliding the bed up and down many times with power off and trying to feel these 2 spots. Your hands are amazingly sensitive and hopefully you can feel this. If you can feel it then you have a check that takes a few seconds to verify if it is fixed or not versus printing for an hour.
It could be bad screw, bad nut, bad z rods, bad bearings, or other interference (does spool holder or anything else touch the bed? Often the spool holder sticks through enough to hit the bed as it passes by).
Usually these things can be fixed without getting new parts but new parts can be amazingly cheap. If your printer is less than a year old you should be able to get the faulty part replaced through warranty but none of these parts costs very much.
Also try loosening the screws that hold the bearings a bit and see if it's now smoother and possibly you need to somehow make the 2 rods more parallel or maybe just loosen and retighten the bearings.
There should be no oil or grease on the vertical rods as that can get into the bearings (along with dirt/dust). The screw of course needs a little grease.
Is this a new printer? Or is this a recent problem on an older printer?
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