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    Solved: Setting Z offset for T1

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    • RajaaKahelundefined
      RajaaKahel @dc42
      last edited by

      @dc42 Tool 1 nozzle is actually longer than Tool 0 nozzle by 0.85mm.
      I updated to:
      Firmware Version: 2.02beta1(RTOS) (2018-08-12b5)
      WiFi Server Version: 1.21RC4(08b3)
      Web Interface Version: 1.22

      Nothing solved.

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      • dc42undefined
        dc42 administrators
        last edited by dc42

        @rajaakahel said in Setting Z offset for T1:

        @dc42 Tool 1 nozzle is actually longer than Tool 0 nozzle by 0.85mm.

        So do you mean the Tool 1 nozzle is 0.85mm lower than tool 0, or higher?

        Where two tools have different nozzle heights, in the tool change files (probably the tpre file) you will need to raise Z so that when you bring in the tool with the lower nozzle after using the other one, its nozzle will be clear of the print. Use command G1 R2 Z0 at or near the end of the tpost file to put it at the right height before continuing the print.

        Duet WiFi hardware designer and firmware engineer
        Please do not ask me for Duet support via PM or email, use the forum
        http://www.escher3d.com, https://miscsolutions.wordpress.com

        RajaaKahelundefined 2 Replies Last reply Reply Quote 0
        • RajaaKahelundefined
          RajaaKahel @dc42
          last edited by

          @dc42 during the last test:
          "I tried again with 50mm Z offset for T1"
          Something very strange happened!
          First T0 was printing, then the tool changed to T1 (nothing happened, no Z offset) but then when the tool changed back to T0 the bed moved by about 50mm down and went back to continue printing.
          After that and before that it didn't move down by 50mm at all.

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          • RajaaKahelundefined
            RajaaKahel @dc42
            last edited by

            @dc42 T1 is higher than T0. I tried with many gcommands to raise the bed, but they didn't work. I'll try now with G1 R2 Z50

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            • RajaaKahelundefined
              RajaaKahel @dc42
              last edited by RajaaKahel

              @dc42
              Ok now the bed is moving down by the value I entered (50mm) Before T1 is activated but it goes back to 0.2mm (the layer height) after T1 is activated. It should go to 50.2mm after T1 is selected and stay there to print. (So now the Z offset is taken into account only during tool change).

              Thank you for your time, we are getting closer 🙂

              ; tfree1.g
              ; called when tool 1 is freed
              G1 R2 Z-50
              M98 P/macros/parkT1

              ; tpre1.g
              ; called before tool 1 is selected

              G1 R2 Z50

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              • RajaaKahelundefined
                RajaaKahel
                last edited by

                I gave up on this. So much time for nothing. Sometimes it works, sometimes it's not. even tho same commands are used and after rebooting and homing. And the most important is in config.g
                The z offset doesn't work. (G10 P1 X0 Y0 Z0.85)

                I'll have to redesign the tool mounts to be adjustable mechanically instead or move back to Marlin..

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                • dc42undefined
                  dc42 administrators
                  last edited by

                  I'll look into this when I get time. However, E3D uses Duets to control their tool changers and they haven't reported any similar problems.

                  Duet WiFi hardware designer and firmware engineer
                  Please do not ask me for Duet support via PM or email, use the forum
                  http://www.escher3d.com, https://miscsolutions.wordpress.com

                  RajaaKahelundefined 1 Reply Last reply Reply Quote 0
                  • RajaaKahelundefined
                    RajaaKahel
                    last edited by

                    I appreciate that! 🙂

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                    • RajaaKahelundefined
                      RajaaKahel @dc42
                      last edited by

                      @dc42
                      Here's a short video I recorded for you so you can see what actually is happening and maybe it makes it easier to solve the problem.
                      I don't have any offset commands set anywhere else other than what you see in config.g.
                      https://www.youtube.com/watch?v=MuGbiBkKNUI

                      zerspaner_gerdundefined 1 Reply Last reply Reply Quote 0
                      • zerspaner_gerdundefined
                        zerspaner_gerd @RajaaKahel
                        last edited by

                        @rajaakahel
                        Try this macro, and parts of what happens.

                        G10 P0 S0 R0
                        G10 P1 S0 R0
                        G28
                        T0
                        G0 X100 Y100 Z50
                        G4 S5
                        M291 P"X100 Y100 Z50 with T0" S2 T0
                        T1
                        G4 S5
                        M291 P"T1 active" S2 T0
                        G0 X100 Y100 Z50
                        G4 S5
                        M291 P"X100 Y100 Z50 with T1" S2 T0
                        
                        T-1
                        

                        Board: Duet WiFi 1.03 | Firmware Version: 3.1.1 | WiFi Server Version: 1.23 | Web Interface Version: 3.1.1

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                        • zerspaner_gerdundefined
                          zerspaner_gerd
                          last edited by zerspaner_gerd

                          Just tested with mine,

                          You have to do 30 negative (just to test)

                          At positive 30 he wants to drive 29.8mm minus, but this would require the bed to be driven 29.8mm higher that does not make the Duet.
                          At T0 Z0 position, it is over

                          Board: Duet WiFi 1.03 | Firmware Version: 3.1.1 | WiFi Server Version: 1.23 | Web Interface Version: 3.1.1

                          RajaaKahelundefined 2 Replies Last reply Reply Quote 0
                          • RajaaKahelundefined
                            RajaaKahel @zerspaner_gerd
                            last edited by

                            @zerspaner_gerd Thank you, I will try with negative value and see if it works

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                            • RajaaKahelundefined
                              RajaaKahel @zerspaner_gerd
                              last edited by

                              @zerspaner_gerd
                              Thank you sir! That's it! in order to move the bed away from the nozzle, the value must be negative not positive!
                              ; Tools
                              M563 P0 D0 H1 ; Define tool 0
                              G10 P0 X0 Y0 Z0 ; Set tool 0 axis offsets
                              G10 P0 R0 S0 ; Set initial tool 0 active and standby temperatures to 0C
                              M563 P1 D1 H2 ; Define tool 1
                              G10 P1 X0 Y0 Z-30 ; Set tool 1 axis offsets
                              G10 P1 R0 S0

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                              • dc42undefined
                                dc42 administrators
                                last edited by

                                Just to be clear, the XYZ parameters in the G10 commands are the offsets of the tip of the nozzle relative to the head reference point. You can choose the head reference point to be wherever you like, but the G10 offsets, G31 offsets for the Z probe and M208 limits must all be specified in terms of the head reference point.

                                It's probably safest to choose the head reference point Z position to be the lowest nozzle you have (or slightly lower), so that the Z values in G10 commands for other tools are all positive.

                                Duet WiFi hardware designer and firmware engineer
                                Please do not ask me for Duet support via PM or email, use the forum
                                http://www.escher3d.com, https://miscsolutions.wordpress.com

                                1 Reply Last reply Reply Quote 1
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