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    Improving auto-calibration.

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    Tuning and tweaking
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    • Qdeathstarundefined
      Qdeathstar
      last edited by

      When you say, "just gripping a piece of paper, is that until the paper can't move, or until we feel some resistance?

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      • Qdeathstarundefined
        Qdeathstar
        last edited by

        One thing i found out while doing this was that my endstops were loosely goosey… i tightened them up and now at least i can get repeatable results 😉

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        • dc42undefined
          dc42 administrators
          last edited by

          @Qdeathstar:

          When you say, "just gripping a piece of paper, is that until the paper can't move, or until we feel some resistance?

          I lower the nozzle until i can feel a significant resistance. The important thing is to be consistent.

          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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          • Qdeathstarundefined
            Qdeathstar
            last edited by

            What do you guys think about my H-values… most of them are negative... i'd expect for them to be centered around zero, not mainly negative?

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            • Jackalundefined
              Jackal
              last edited by

              Qdeathstar, in what way does the auto calibration got worse?
              Your H values seems ok to me, I am probing 32 points and my H values add up to 1.6
              I don't think the effect of the end effector tilt would simply make them center around 0

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              • Qdeathstarundefined
                Qdeathstar
                last edited by

                Sorry, i did not find the real trigger height, i subtracted z-values (which made the h-values the inverse of what they needed to be)… I think i have the issue fixed, im testing now. The z-height overall was a little low on the first go.

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                • Jackalundefined
                  Jackal
                  last edited by

                  Glad to hear you got it solved

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                  • Qdeathstarundefined
                    Qdeathstar
                    last edited by

                    well, i got that part of it solved but now it seems like the area across from the y tower is a little low and the area close to the y tower heading around to the z-tower is low…

                    i'm wondering if i can make manual adjustments to the H values to dial it in?

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                    • dc42undefined
                      dc42 administrators
                      last edited by

                      You should only use H corrections to compensate for actual variations in trigger height, which on a delta printer are usually caused by effector tilt. If you are still getting significant errors close to points that are included in the auto calibration bed probing, either fix the geometrical errors that are causing them, or use the new grid bed compensation in the 1.17dev6 build after auto calibration to compensate for them.

                      I have it on my list to add a wiki page on delta calibration.

                      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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                      • Qdeathstarundefined
                        Qdeathstar
                        last edited by

                        Thank you. Geometrical errors in this case are most likely to be a warped bed, correct? Or is there something else i should check?

                        Also, should the nozzle hit the bed at z=0 for x=0 & y = 0? When i check there i got .25mm off the bed?

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                        • Qdeathstarundefined
                          Qdeathstar
                          last edited by

                          actually, it turns out when i found out my endstops were loose, i never readjusted z=0….

                          I redid the h-value test and now it's almost perfect!

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                          • dc42undefined
                            dc42 administrators
                            last edited by

                            @Qdeathstar:

                            Also, should the nozzle hit the bed at z=0 for x=0 & y = 0? When i check there i got .25mm off the bed?

                            Yes it should be much closer to zero height than that. Perhaps your trigger height in the G31 command is not set correctly?

                            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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                            • Qdeathstarundefined
                              Qdeathstar
                              last edited by

                              Thats not the only issue i had, after reading your comment DC42, (and haivng some other issues with prints) I discovered my steps/mm setting was off. I had it as 82.5 steps/mm instead of 80 steps/mm…

                              Originally, i had to fudge some of the H-values to get the circle to print correctly, now it looks great w/o the fudging! (even better). Ill edit in a picture once its completed.

                              Just posting this for posterity. Thanks for your help.

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