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    Help with starting print height after modding a qidi tech 1

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    • dakingofhearts2003undefined
      dakingofhearts2003
      last edited by

      ; homez.g
      ; called to home the Z axis
      ;
      ; generated by RepRapFirmware Configuration Tool v3.1.4 on Sat Jul 25 2020 12:56:48 GMT-0400 (Eastern Daylight Time)
      G91 ; relative positioning
      G1 H2 Z5 F6000 ; lift Z relative to current position
      G1 H1 Z205 F1800 ; move Z up until the endstop is triggered
      G92 Z0 ; set Z position to axis maximum (you may want to adjust this)

      ; Uncomment the following lines to lift Z after probing
      ;G91 ; relative positioning
      ;G1 Z5 F100 ; lift Z relative to current position
      ;G90 ; absolute positioning

      Phaedruxundefined 1 Reply Last reply Reply Quote 0
      • Phaedruxundefined
        Phaedrux Moderator @dakingofhearts2003
        last edited by

        @dakingofhearts2003 said in Help with starting print height after modding a qidi tech 1:

        G1 H1 Z205 F1800 ; move Z up until the endstop is triggered
        G92 Z0 ; set Z position to axis maximum (you may want to adjust this)

        That doesn't make any sense. It moves to the high end of the Z axis and then sets it as Z0.

        Plus your Z endstop is defined as being on the low end.

        M574 Z1 S1 P"zstop" ; configure active-high endstop for high end on Z via pin zstop

        Where are you endstops physically located? I think you've got a motor direction wrong and maybe a homing move incorrect as well.

        You startup gcode doesn't have anywhere that it homes Z either, just X and Y. Are you using homeall or homez at all?

        @dakingofhearts2003 said in Help with starting print height after modding a qidi tech 1:

        he process i used was the bed to touch the nozzle and used g92 z0 followed by m500.

        M500 doesn't work that way, but touching the nozzle to the bed and sending G92 Z0 would set the height correctly.

        Z-Bot CoreXY Build | Thingiverse Profile

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        • dakingofhearts2003undefined
          dakingofhearts2003
          last edited by

          The endstop is bed level 0 and as it prints the bed moves down. Everything homes correctly but it keeps starting the prints about 5 mm above the bed if i can fix that im good. some settings in the config i may have changed without changing the explanation to match. like the endstops, i have no problem homing.

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

            @dakingofhearts2003 said in Help with starting print height after modding a qidi tech 1:

            G1 H1 Z205 F360 ; move Z up stopping at the endstop
            G90 ; absolute positioning
            G92 Z0 ; set Z position to axis maximum (you may want to adjust this)

            Ok so if you endstop is located at Z min, then your homing move in homeall and homez is going the wrong way.

            Should be G1 H1 Z-205 F360

            If G1 Z205 is moving towards the endstop, then your Z axis motor is rotating the wrong way.

            When jogging the Z axis does Z+ move the bed and nozzle farther apart and Z- closer together?

            Z-Bot CoreXY Build | Thingiverse Profile

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            • dakingofhearts2003undefined
              dakingofhearts2003 @Phaedrux
              last edited by

              @Phaedrux i assure you everything is correct i made my own wires and so i had to reverse somethings. If the bed went the wrong way i wouldnf be able to home successfully.

              Phaedruxundefined 1 Reply Last reply Reply Quote 0
              • Phaedruxundefined
                Phaedrux Moderator @dakingofhearts2003
                last edited by

                @dakingofhearts2003 said in Help with starting print height after modding a qidi tech 1:

                Everything homes correctly but it keeps starting the prints about 5 mm above the bed if i can fix that im good.

                After you homeall are you able to jog the nozzle down so that Z0 has the nozzle just touching the bed?

                Z-Bot CoreXY Build | Thingiverse Profile

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                • fcwiltundefined
                  fcwilt
                  last edited by fcwilt

                  Hi,

                  The process you used: Move nozzle to touch bed, G92 Z0 and then M500.

                  What do you think M500 does in this case?

                  Frederick

                  Printers: a E3D MS/TC setup and a RatRig Hybrid. Using Duet 3 hardware running 3.4.6

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                  • dakingofhearts2003undefined
                    dakingofhearts2003
                    last edited by

                    20201117_221944.jpg

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                    • dakingofhearts2003undefined
                      dakingofhearts2003
                      last edited by

                      This is how close it is after homing

                      fcwiltundefined 1 Reply Last reply Reply Quote 0
                      • fcwiltundefined
                        fcwilt @dakingofhearts2003
                        last edited by

                        @dakingofhearts2003 said in Help with starting print height after modding a qidi tech 1:

                        This is how close it is after homing

                        You need to determine how far from the bed the nozzle is at that point.

                        Then you need to adjust the G92 Z0 line to specify the actual Z position at that point, and it is clearly not 0.

                        Let's say you determine the nozzle is exactly 5mm off the bed.

                        Then the line should read G92 Z5.

                        So then moving to Z0 would move down 5mm and should touch the bed.

                        Frederick

                        Printers: a E3D MS/TC setup and a RatRig Hybrid. Using Duet 3 hardware running 3.4.6

                        dakingofhearts2003undefined 1 Reply Last reply Reply Quote 0
                        • dakingofhearts2003undefined
                          dakingofhearts2003 @fcwilt
                          last edited by

                          @fcwilt i did that and still this is what i get

                          20201117_224510.jpg

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                          • fcwiltundefined
                            fcwilt
                            last edited by

                            Hi,

                            So you modified the G29 Z# line in the homez.g file?

                            And the nozzle is now farther away?

                            Frederick

                            Printers: a E3D MS/TC setup and a RatRig Hybrid. Using Duet 3 hardware running 3.4.6

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                            • Phaedruxundefined
                              Phaedrux Moderator @dakingofhearts2003
                              last edited by

                              @dakingofhearts2003 said in Help with starting print height after modding a qidi tech 1:

                              i assure you everything is correct

                              And yet your nozzle is 5mm above the bed. 🤔

                              Z-Bot CoreXY Build | Thingiverse Profile

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