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    Delta printing height map diagnostics help

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    • sneakyferretundefined
      sneakyferret @sneakyferret
      last edited by

      I am hoping its just something simple I am missing. You guys are great for everything!

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      • Phaedruxundefined
        Phaedrux Moderator
        last edited by

        I'd give it a good mechanical check over. See if anything is cracked, or loose, or wiggles.

        Z-Bot CoreXY Build | Thingiverse Profile

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        • sneakyferretundefined
          sneakyferret @Phaedrux
          last edited by

          @Phaedrux Have been going over it with a fine tooth comb and so far nothing stands out.

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          • sneakyferretundefined
            sneakyferret @sneakyferret
            last edited by

            @sneakyferret I've checked everything mechanical from tower bolts to stepper motor set screws on my delta printer. The only thing I really notice that's suspicious is that my belt tensions may could be tightened further but its not like they're floppy loose.

            Anything else come to mind?

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            • Phaedruxundefined
              Phaedrux Moderator
              last edited by

              Generate a new bed.g file? I'm not a delta user, so my help is pretty limited.

              When in doubt though it's good to go back to basics

              https://docs.duet3d.com/en/User_manual/Machine_configuration/Configuration_linear_delta
              https://docs.duet3d.com/en/User_manual/Tuning/Delta_calibration

              Z-Bot CoreXY Build | Thingiverse Profile

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              • sneakyferretundefined
                sneakyferret @Phaedrux
                last edited by

                @Phaedrux Appreciate the reply, but I have been over the initial calibration and mesh compensations step by step repeatedly, making sure to follow each step and the result is the same. 😞

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                • sneakyferretundefined
                  sneakyferret @sneakyferret
                  last edited by

                  @sneakyferret Ok, update! I was following this instructional here and placed trigger height corrections at each of my bed.g points.
                  instructional.png
                  After this, this resulted in the above SUPER skewed height map. I got curious and removed those Hxxx corrections at the end of my bed.g points. Lo and behold:
                  correctedheightmap.png
                  A much more reasonable looking height map!

                  I followed the instructional by measuring trigger height at each of the coordinates and taking that value, subtracting it from the center point trigger height, and placed those values in bed.g. Only problem is I didn't see that it says to place them in G31 commands.. My bed file doesn't contain any G31 commands! 😄

                  I appreciate no one being impatient with me during this. What exactly is G31 used for? I don't understand what everyone says about it.

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                  • Phaedruxundefined
                    Phaedrux Moderator
                    last edited by

                    G31 defines the offset between the nozzle and probe.

                    https://docs.duet3d.com/en/User_manual/Reference/Gcodes#g31-set-or-report-current-probe-status

                    Z-Bot CoreXY Build | Thingiverse Profile

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                    • dc42undefined
                      dc42 administrators @sneakyferret
                      last edited by

                      @sneakyferret you should not need to use trigger height corrections when using a Smart Effector. The trigger height should be much the same all over the bed, typically about -0.1mm. What range of trigger heights did you measure, and how did you measure them?

                      When you run auto calibration what results does it report?

                      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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                      • sneakyferretundefined
                        sneakyferret @dc42
                        last edited by

                        @dc42 not too bad. Max deviations are -.148 and .154 at the low and high end. I measured the trigger heights by taking my bed.g coordinates, driving the nozzle to each point, use G30 S-1 to do a single probe and have it display the trigger height. I'll have to re run auto cal to see what it reads out but my bed leveling looks much better now.

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