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1.18 Z height offset question

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  • undefined
    dc42 administrators
    last edited by 9 Apr 2017, 06:13

    Was your G31 Z offset previously -0.15 or -0.55 ?

    0.2mm is a larger change than I would expect.

    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

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    • undefined
      mhackney
      last edited by 9 Apr 2017, 13:01

      It was previously -.15 mm

      My 3D Printing blog: http://www.sublimelayers.com
      Coming this summer: "3D Printing Strategies - the art of perfecting your designs and prints"

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      • undefined
        dc42 administrators
        last edited by 9 Apr 2017, 16:19

        I think that reduction in trigger height was spurious, nothing to do with the firmware upgrade. If anything, the trigger height should be higher using 1.18, not lower.

        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

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        • undefined
          mhackney
          last edited by 9 Apr 2017, 19:10

          I've gone through the printer mechanics and configs and it is still behaving as described. Multiple deletes of config-override and resets. It's almost as if G31 Z offset is not being applied.

          My 3D Printing blog: http://www.sublimelayers.com
          Coming this summer: "3D Printing Strategies - the art of perfecting your designs and prints"

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          • undefined
            mhackney
            last edited by 9 Apr 2017, 23:05

            David, I downgraded to 1.17 and my original Z offset is working perfectly. I'll re-convert to 1.18 when I get time early this week and try again.

            My 3D Printing blog: http://www.sublimelayers.com
            Coming this summer: "3D Printing Strategies - the art of perfecting your designs and prints"

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            • undefined
              dc42 administrators
              last edited by 10 Apr 2017, 06:52

              Michael, have you tried printing using 1.18 and your old height offset?

              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

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              • undefined
                dc42 administrators
                last edited by 10 Apr 2017, 08:26

                @mhackney:

                I've gone through the printer mechanics and configs and it is still behaving as described. Multiple deletes of config-override and resets. It's almost as if G31 Z offset is not being applied.

                That can happen if you put the G31 command earlier in config.g than the M558 command. This is because RRF stores different G31 parameters for different types of Z probe, to allow you to use more than one probe.

                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

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                • undefined
                  mhackney
                  last edited by 10 Apr 2017, 12:53

                  @dc42:

                  Michael, have you tried printing using 1.18 and your old height offset?

                  David, yes that is actually what I was trying to articulate above. With the same height offset I had to baby step down an additional 0.20mm. If I then change my height offset to -.35mm I STILL have to baby step down .20mm. That's what's strange. I see your second post about order so let me verify that, although once committed to config-override.g the correct order is captured, correct?

                  My 3D Printing blog: http://www.sublimelayers.com
                  Coming this summer: "3D Printing Strategies - the art of perfecting your designs and prints"

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                  • undefined
                    mhackney
                    last edited by 10 Apr 2017, 12:56

                    @dc42:

                    @mhackney:

                    I've gone through the printer mechanics and configs and it is still behaving as described. Multiple deletes of config-override and resets. It's almost as if G31 Z offset is not being applied.

                    That can happen if you put the G31 command earlier in config.g than the M558 command. This is because RRF stores different G31 parameters for different types of Z probe, to allow you to use more than one probe.

                    Understood and I do have them in the correct order. I actually take advantage of the ability to support different probes on one of my test machines that has the IR probe, FSRs and an accelerometer probe on it so I can do comparisons. On this machine I have:

                    [[language]]
                    ; Z probe and compensation definition
                    M558 P4 X0 Y0 Z0 F250 H3 I1 T3500
                    ; grid compensation
                    M557 R110 S15
                    G31 T4 X0 Y0 Z-.20 ; Set the z probe offset and threshold

                    My 3D Printing blog: http://www.sublimelayers.com
                    Coming this summer: "3D Printing Strategies - the art of perfecting your designs and prints"

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                    • undefined
                      dc42 administrators
                      last edited by 10 Apr 2017, 12:57

                      As long as you had the correct probe type selected when you sent the G31 command, then M500 will save it correctly in config-override.g. The G31 commands in that file use the T parameter to say what probe type they refer to. As far as I know, that parameter works correctly. If you suspect it doesn't, run G31 Tn where n is your probe type (as in M558 P parameter) and it will tell you the trigger height that it is using.

                      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

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                      • undefined
                        mhackney
                        last edited by 4 Oct 2017, 19:33 10 Apr 2017, 19:26

                        Today I built a new CF card from a backup set of config files I had. I turned off the printer, installed the new card and restarted. Verified that there was no config-override.g, checked my offsets, Z height and other calibration settings. All looked good. Calibrated, looked good (0.01 deviation) then I verified height and it seemed spot on. Started a print and the first layer looks fine. I'm waiting for it (1 layer) to complete so I can verify thickness.

                        But it does seem like I must have displeased the 3D Printing Deities this weekend and now I'm back in good standing.

                        My 3D Printing blog: http://www.sublimelayers.com
                        Coming this summer: "3D Printing Strategies - the art of perfecting your designs and prints"

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                        • undefined
                          sLpFhaWK
                          last edited by 11 Apr 2017, 03:28

                          hopefully my red head sacrifice takes hold and the gods will be pleased with me. we'll find out tomorrow, I don't wish to pursue any 3d printing tonight.

                          -sLpFhaWK
                          Ultibots K250v
                          Rostock Max v2 Soon to be Full MetalMax
                          Mini Kossel

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