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    Modified Ender-3 behaves strangely when starting to print

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    • Phaedruxundefined
      Phaedrux Moderator
      last edited by Phaedrux

      Post your homeall and homez.

      Post your slicer start gcode.

      Do you also have a start.g file in your system folder?

      Z-Bot CoreXY Build | Thingiverse Profile

      Phaedruxundefined 1 Reply Last reply Reply Quote 0
      • Tanel_76undefined
        Tanel_76
        last edited by

        Hi,

        I threw the start.g out, after that the anomalies disappeared.

        The only issue is now the Z height, I have calibrated and reset the (G92 Z0)
        got the trigger height 2.4 and I have it in mu config.g
        Still, when starting to print, the nozzle goes like 4.5mm downwards
        from the calibrated height.

        I deleted the slicer start code (the initial line in Cura)
        just to see, what's happening.

        Vetiundefined 1 Reply Last reply Reply Quote 0
        • Phaedruxundefined
          Phaedrux Moderator @Phaedrux
          last edited by

          @Phaedrux said in Modified Ender-3 behaves strangely when starting to print:

          Post your homeall and homez.

          Z-Bot CoreXY Build | Thingiverse Profile

          1 Reply Last reply Reply Quote 0
          • Tanel_76undefined
            Tanel_76
            last edited by

            Homeall
            homez.g

            I think these are pretty standard.

            1 Reply Last reply Reply Quote 0
            • Vetiundefined
              Veti @Tanel_76
              last edited by

              @Tanel_76 said in Modified Ender-3 behaves strangely when starting to print:

              got the trigger height 2.4 and I have it in mu config.g

              post you new config, you might have made a mistake

              1 Reply Last reply Reply Quote 0
              • Tanel_76undefined
                Tanel_76
                last edited by Tanel_76

                The last conf file is here:
                https://pastebin.com/npPJ2iSK

                It's basically the same conf.g that I had uploaded earlier,
                I just changed the M671 and also thermistor settings.

                I copied the CaLviNx bed.g that he generously posted here.

                When I start a print job, the nozzle goes down about 4.5mm,
                I also recalibrated the Z height about 5 times,
                the drop in Z height was constant every time.

                Vetiundefined 1 Reply Last reply Reply Quote 0
                • Vetiundefined
                  Veti @Tanel_76
                  last edited by

                  @Tanel_76

                  so when you enter G28

                  and move to G0 Z0 then nozzle is above the bed?

                  Tanel_76undefined 1 Reply Last reply Reply Quote 0
                  • Tanel_76undefined
                    Tanel_76 @A Former User
                    last edited by

                    @CaLviNx said in Modified Ender-3 behaves strangely when starting to print:

                    I have an operational config.g if you want a copy

                    Is it possible to see the conf.g that you are using?

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                    • Tanel_76undefined
                      Tanel_76 @Veti
                      last edited by Tanel_76

                      @Veti said in Modified Ender-3 behaves strangely when starting to print:

                      @Tanel_76

                      so when you enter G28

                      and move to G0 Z0 then nozzle is above the bed?

                      No, and that's the strange thing. after resetting Z
                      I go G1 Z100 F400 and come down to G1 Z5 F400
                      the nozzle ploughs into the bed. When I move
                      down step by step, I see that the nozzle is above the
                      bed around Z55 which is not logical at all.

                      It's as if the G92 Z0 value is not entered correctly
                      and the Duet gets another value from somewhere,
                      which I can't find.

                      PS Im using this guide
                      https://duet3d.dozuki.com/Wiki/Test_and_calibrate_the_Z_probe#:~:text=In Duet Web Control%2C go,Save the file.

                      And Duet seems to have the same symptoms, as if when you forget the M500 command after resetting Z in Marlin.
                      I have to go to config-override.g and check that there are no G31 commands, when I'm near the printer again.

                      Vetiundefined 1 Reply Last reply Reply Quote 0
                      • Vetiundefined
                        Veti @Tanel_76
                        last edited by

                        issue the G31 command to see if the duet got your offset set.

                        1 Reply Last reply Reply Quote 0
                        • Phaedruxundefined
                          Phaedrux Moderator
                          last edited by

                          Where are you sending G92 Z0? I don't see that anywhere in your homing files.

                          G90 ; absolute positioning
                          G1 X-5 Y-5 F6000 ; go to first bed probe point and home Z
                          G30 ; home Z by probing the bed

                          Also, from your homing files the G1 XY move makes no sense. It looks like it's just pushing it into the corner? The choice of an absolute negative value seems odd since your M208 minimum doesn't allow negative positions.

                          Regardless. You should choose a position that places the probe at the center of the bed.

                          Also, remove M564 H0 ; Allow unhomed movement from your config just to make sure it's not allowing moves that would otherwise fail. It can be hiding issues that should be fixed.

                          Z-Bot CoreXY Build | Thingiverse Profile

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                          • Tanel_76undefined
                            Tanel_76 @Phaedrux
                            last edited by

                            @Phaedrux said in Modified Ender-3 behaves strangely when starting to print:

                            Where are you sending G92 Z0? I don't see that anywhere in your homing files.

                            When calibrating the Z height, I'm sending the command G92 Z0 to tell the firmware that the head is at Z=0,
                            it's not in the homing files.

                            I try to get access to the printer and go through the code once more.

                            1 Reply Last reply Reply Quote 0
                            • Tanel_76undefined
                              Tanel_76
                              last edited by

                              Got everything working, in the end I just ditched the line M564 H0
                              and everything else stayed as it was - and it's printing!

                              Thanks.

                              1 Reply Last reply Reply Quote 1
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