IMG_20231111_205431

I cant get my Anycubic Kobra 2 with Klipper to print correct. The first mm of each layer are faulty, resulting in a bad tooth in gears.

I tried to slow down the print, tried to minimize/deactivate retraction, fiddled with z offset and first layer height, lowered bed temp, altered the extrusion rate. Nothing works. Everything else seems fine, slim z seam, nice walls, no over/underextrusion.

Anyone got a hint how i could fix that?

Edit: I cancelled that Print, the Problem is only in the first tooth:

IMG_20231111_212736_745

the tooth in the marking should look like the ones above it.

  • NaibofTabr@infosec.pubEnglish
    7·
    1 year ago

    I can see that your printer is doing some nozzle priming lines on the side of the bed before it starts the actual print.

    Does it retract after finishing the priming lines? It may be retracting too far/not recovering far enough before it starts the print moves, and depending on the slicer and printer firmware specifics, that function might not be controlled by normal retraction settings.

    • PixeIOrange@feddit.deOPEnglish
      3·
      1 year ago

      I changed every retraction setting ive found. 2x in PrusaSlicer, 1x on Klipper, nothing changes. But with Cura Slicer the problem is gone. So i obviously f*ed up some setting in PrusaSlicer. Will test more today.

        • PixeIOrange@feddit.deOPEnglish
          1·
          1 year ago

          In PrusaSlicer externals first, in cura outside to inside. Whats weird in cura, it prints the outter wall ls first half gears first, then the spokes from the second half.

      • NaibofTabr@infosec.pubEnglish
        2·
        1 year ago

        That is interesting. Does CuraSlicer do the same priming lines? Have you tried the print with PrusaSlicer without the priming lines?

        If you can figure out what Cura is doing differently in that section of the gcode you could put those lines in the custom gcode box in PrusaSlicer and get the same results.

        • PixeIOrange@feddit.deOPEnglish
          2·
          1 year ago

          It does the same priming lines, im using the same start gcode. Without it would miss the complete first half of the gears outter wall, oftem from the 5 lines only 3 get printed.

          • NaibofTabr@infosec.pubEnglish
            1·
            1 year ago

            Right, ok, so I’m not particularly familiar with Cura… I use SuperSlicer which is a fork of Prusa (which is a fork of Slic3r). Neither slicer has a UI option for initial purge lines as far as I can tell.

            So for both Prusa and Cura you are using a block of custom start gcode to define the purge lines? Exactly the same gcode in both slicers?

            Could you please share the Cura gcode output in addition to the Prusa version you shared? I am curious what the difference is.