2 identical P1S - different results

Hello Guys!

I have a problem with my 3D printer.

Both models printed on standard Bambu settings, my own modified ones and different combinations.

The result is always the same: artifacts on the wall:

at the bottom P1S_GOOD (my first printer, as a reference) at the top P1S_BAD (2nd printer) .

rich text editor image

This happens around the seam .

Filament: Eryone PETG-CF, 250 deg plate, 80deg bed.

I have some experience with 3D printing so I tried the following:

  1. Software
  • Pressure Advance - identical in both printers for this filament, changing to “0” makes no difference.

  • Changing flow - no difference

  • Changing retraction - no difference

  • Changing wipe - no difference

  • Changing speed/acc for all parameters (eg. outer wall, innerwall, infill) - no difference

  1. Hardware
  • Belt tensioning - no difference

  • Cleaning all rails - no difference

  • Lubricating linear rails - no difference

  • I swapped Extruder (from good printer to bad printer) - no difference

  • Changed nozzle (inc. changing thermal paste) - no difference

  • Checked and cleaned filament path - it’s buttery smooth - no difference

I’ve stuck to this particular filament because it’s the only one I use to print items for my e-shop.

Do you have any other ideas I could try?

I’ve been thinking about the extruder motor, but I can’t afford to stop one printer and test on another.

My conclusion is as follows: if GCODE is identical, PA identical, filament the same then it must be a hardware problem , do you agree?

Thanks a lot for any tips.

Regards!