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    Z Probe Trigger Height G30 S-1 height changing every probe

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    • apex2011undefined
      apex2011 @jrsphoto
      last edited by

      @jrsphoto I tried making this adjustment, unfortunately I am still having the same issue

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      • dc42undefined
        dc42 administrators
        last edited by

        It looks like the trigger height is decreasing with every probe. The most likely cause of this is that when the probe triggers and Z movement is stopped abruptly, the Z motors are unable to stop immediately. So they overshoot, leaving the print head lower than the firmware thinks it is.

        To test this theory, try reducing the probing speed, which is the F parameter in M558. You currently have F100, so try F50.

        Another possibility is that you have the Z acceleration too high or the motor current too low, so that when you command Z to move back up 5mm, steps are lost during the initial acceleration. To test this, try reducing the Z acceleration in the M201 command. You currently have Z120, so try Z60.

        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

        droftartsundefined apex2011undefined 2 Replies Last reply Reply Quote 0
        • droftartsundefined
          droftarts administrators @dc42
          last edited by

          @dc42 said in Z Probe Trigger Height G30 S-1 height changing every probe:

          It looks like the trigger height is decreasing with every probe.

          Isn't the trigger height increasing with each probe? Newest is first, oldest last. That's what had me stumped.

          8:24:50 PM Stopped at height 0.595 mm
          8:24:39 PM Stopped at height 0.582 mm
          8:24:32 PM Stopped at height 0.570 mm
          8:23:49 PM Stopped at height 0.553 mm
          8:23:40 PM Stopped at height 0.540 mm

          Ian

          Bed-slinger - Mini5+ WiFi/1LC | RRP Fisher v1 - D2 WiFi | Polargraph - D2 WiFi | TronXY X5S - 6HC/Roto | CNC router - 6HC | Tractus3D T1250 - D2 Eth

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          • apex2011undefined
            apex2011 @dc42
            last edited by

            @dc42 I tried both of these suggestions one at a time. I am still receiving the same result.

            6:19:38 PMG30 S-1
            Stopped at height 0.452 mm

            6:19:29 PMG30 S-1
            Stopped at height 0.438 mm

            6:19:01 PMG30 S-1
            Stopped at height 0.423 mm
            6:18:54 PMM120

            6:18:50 PMG30 S-1
            Stopped at height 0.410 mm

            6:18:29 PMG30 S-1
            Stopped at height 0.382 mm

            6:18:17 PMG30 S-1
            Stopped at height 0.368 mm

            6:18:08 PMG30 S-1
            Stopped at height 0.357 mm

            6:17:57 PMG30 S-1
            Stopped at height 0.340 mm

            6:12:57 PMG30 S-1
            Stopped at height 0.315 mm

            6:12:42 PMG30 S-1
            Stopped at height 0.298 mm

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            • apex2011undefined
              apex2011
              last edited by

              Thank you everyone that has given me input, I am very confused with this. I've been messing with the M558 Line. It now reads every 2 stop heights the same.

              Here is what I changed it to M558 P9 H6 F80 T6000 A10 S0.005 B1 R0.5

              8:33:00 PMG30 S-1
              Stopped at height 0.510 mm

              8:32:51 PMG30 S-1
              Stopped at height 0.510 mm

              8:32:42 PMG30 S-1
              Stopped at height 0.507 mm

              8:32:33 PMG30 S-1
              Stopped at height 0.507 mm

              8:32:24 PMG30 S-1
              Stopped at height 0.507 mm

              8:32:13 PMG30 S-1
              Stopped at height 0.505 mm

              8:32:00 PMG30 S-1
              Stopped at height 0.505 mm

              8:31:47 PMG30 S-1
              Stopped at height 0.498 mm

              8:31:37 PMG30 S-1
              Stopped at height 0.498 mm

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              • apex2011undefined
                apex2011
                last edited by

                As a temporary measure I've backed up my config and reverted back to manual leveling. I have yet to successfully print since switching to the Duet board. Hopefully this gets me going.

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                • dc42undefined
                  dc42 administrators
                  last edited by

                  Let us know how you get on. I notice that you are currently losing about 0.0025mm every other probe attempt, which at the 400 microsteps/mm you are using is 1 microstep. This gives me an idea about what may be happening.

                  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

                  Phaedruxundefined 1 Reply Last reply Reply Quote 0
                  • dc42undefined
                    dc42 administrators
                    last edited by

                    @apex2011, how do you have the Z motors connected to the Duet?

                    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 0
                    • apex2011undefined
                      apex2011
                      last edited by

                      I followed this document (Step 10) https://duet3d.dozuki.com/Guide/Ender+3+Pro+and+Duet+Maestro+Guide+Part+1:+Wiring/37

                      Modified the plug so it would connect directly to the Duet without re-terminating.

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                      • apex2011undefined
                        apex2011
                        last edited by

                        @dc42 I decided to take everything back to step one and go through the entire process again in case I missed something. I am still getting the same issue where the probe reads a different value every time

                        Turboundefined 1 Reply Last reply Reply Quote 0
                        • Turboundefined
                          Turbo @apex2011
                          last edited by

                          @apex2011 What's your current on the z motors? it definitely sounds like you're losing a step.

                          Cant stop tuning wont stop tuning.
                          Dbot, Custom i3, Voron 0&2

                          apex2011undefined 1 Reply Last reply Reply Quote 0
                          • apex2011undefined
                            apex2011 @Turbo
                            last edited by

                            @Turbo Sorry if this is a dumb question but how do I confirm this?

                            Turboundefined 1 Reply Last reply Reply Quote 0
                            • Turboundefined
                              Turbo @apex2011
                              last edited by

                              @apex2011 in your config.g file, you'll have a line that looks like this:

                              M906 X1000 Y1000 Z1000 E850:850 I50 ; Set motor currents (mA) and motor idle factor in per cent
                              

                              the z value is what you're after, and should be around 800 or so.

                              Cant stop tuning wont stop tuning.
                              Dbot, Custom i3, Voron 0&2

                              apex2011undefined 1 Reply Last reply Reply Quote 0
                              • apex2011undefined
                                apex2011 @Turbo
                                last edited by

                                @Turbo ah OK, that is
                                M906 X800 Y800 Z800 E900 I30 ; set motor currents (mA) and motor idle factor in per cent

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                                • Turboundefined
                                  Turbo
                                  last edited by

                                  okay so current looks fine. you could try bumping up by a factor of 50 to 100 and see if you get any changes, but I'm not sure about that one.
                                  you could also adjust the electromagnet on the bltouch by tightening/loosening the allen screw on top, again, not sure, but im throwing things out there that might help.

                                  Cant stop tuning wont stop tuning.
                                  Dbot, Custom i3, Voron 0&2

                                  apex2011undefined 1 Reply Last reply Reply Quote 0
                                  • apex2011undefined
                                    apex2011 @Turbo
                                    last edited by

                                    @Turbo thanks! I'll give those a try

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                                    • Phaedruxundefined
                                      Phaedrux Moderator
                                      last edited by

                                      Also might help to check the tension on your V wheels on the Z carriage. Check the lead screw nut as well to see if it's loose in its mount or something. Check the lead screw coupler too. And Z motor mount.

                                      It was asked earlier, but are you testng with the bed warmed up? Have you PID tuned the bed heater? Running the bed heater in bang-bang mode can cause the heating plate to flex slightly as it cycles current through it. Hard to probe a moving target.

                                      Z-Bot CoreXY Build | Thingiverse Profile

                                      apex2011undefined 1 Reply Last reply Reply Quote 0
                                      • apex2011undefined
                                        apex2011 @Phaedrux
                                        last edited by

                                        @Phaedrux I just checked the tension on the V wheels, it looks good, there's no play on the rail. I have done PID tuning. I have been testing with the bed cold

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                                        • Phaedruxundefined
                                          Phaedrux Moderator
                                          last edited by

                                          Firmware version?

                                          Z-Bot CoreXY Build | Thingiverse Profile

                                          apex2011undefined 1 Reply Last reply Reply Quote 0
                                          • apex2011undefined
                                            apex2011 @Phaedrux
                                            last edited by

                                            @Phaedrux Firmware 2.03 (2019-06-13b2)
                                            Web 1.22.2

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