Horizontal "pits" are repeated on the 3D model (maybe not a wobbling)

[wazls]

On any model there are such "pits", how to solve this problem?

Note:

• the 3D model's fan does not work (broken)

• PLA plastic (temperature: nozzle-210, bed-55)

• nozzle 0.4

• slicer Cura 4.5

Thanks!

[William]

Hi, You can check whether the lower z-axis threaded rod is bent or caused by missing teeth,
Check whether the mechanism is loose and fasten it.

[wazls]

I printed out and installed this model while there are no deep pits. Apparently the Z axis isn't exactly perpendicular

[William]

Hi，

you can check whether the Z-axis threaded rod shakes.

If the fan is damaged, you can lower the temperature appropriately.

[wazls]

Just a little bit, minimal backlash to the left and right. I think this is not critical. So far the problem seems to be fixed, I hope for a long time.