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    Nozzle dragging

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    • DR8
      DR8 last edited by

      I'm using Cura 3.0 and everytime my nozzle is performing a travel move, it will drag the perimeters or the infill. So the bad way is when I got layer shift. I have Z hop enabled in cura and if I print two parts with space between them I get a z lift. But not when the head is printing the same part. What should i tweak? And also, it seems like everytime I have a head travel move, the first thing is the travel move is performed and then I get retraction. I thought first time i should get a retraction and then a travel move not reverse.
      In this picture https://ibb.co/d0u2aR the blue line indicates a travel move. On that travel move I want to have a Z lift but I don't have it.

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      • burtoogle
        burtoogle last edited by

        That's controlled by the combing setting. By default it enables combing everywhere. The alternative settings are no combing on skin regions or no combing at all. Myself, I nearly always set the combing mode to "no skin" except when printing super runny stuff like PETG when I disable combing completely. Hope this helps.

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        • DR8
          DR8 last edited by

          You rock. Problem solved. Thanks alot!

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          • DR8
            DR8 last edited by

            Beside the fact that now everytime a retraction is made, the Z hop is performed, there are still some travel moves over the printed part when retraction is not active. So, the Z hop is not performed. And I have some cases when during this travel moves, the print head is hitting an infill or perimeter and I'll get skipped steps. Is there a way to have the Z hop at travel move even when I don't get retraction?

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            • burtoogle
              burtoogle last edited by

              Hi, I'm not totally sure what the problem is there, can you post a link to a sample gcode so I can check it out?

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              • deckingman
                deckingman last edited by

                If the nozzle is hitting previously printed infill or perimeters, that would indicate to me that those parts have been over extruded.

                Ian
                https://somei3deas.wordpress.com/
                https://www.youtube.com/c/deckingman/

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                • DR8
                  DR8 last edited by

                  https://we.tl/IhYJToyFiE

                  here it is. What I did after this i have lowered the travel speed to 150mm/s and the print speed to 60mm/s. I can still hear the nozzle hitting but because it's at lower speed, it won't skip steps.

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                  • burtoogle
                    burtoogle last edited by

                    That gcode was created with combing mode = all so it will move over any of the existing lines with no z-hop and no retraction. If you want to reduce the amount the nozzle smashes into the existing lines, set the combing mode to "no skin" or turn it off completely (as mentioned above). Cheers.

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                    • DR8
                      DR8 last edited by

                      @burtoogle:

                      That gcode was created with combing mode = all so it will move over any of the existing lines with no z-hop and no retraction. If you want to reduce the amount the nozzle smashes into the existing lines, set the combing mode to "no skin" or turn it off completely (as mentioned above). Cheers.

                      Yep, it's getting better and better. I also have a problem with over-extrusion at the edge of perimeters on solid infill. I don t have a picture but i think I have to tweak my jerk. Now it's 15mm/s. When I print the solid infill at 120mm/s speed, the print head is making a small pause when touching the inside perimeter (inside edge of the object). In that time, extruder still have some inertia and will extrude more than it's needed. I'm thinking increasing jerk will make the print head to not pause that long when touching perimeters.

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                      • burtoogle
                        burtoogle last edited by

                        I wish you good luck, I wouldn't dream of trying to print anything at 120mm/s but, then again, my priority is quality rather than speed.

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