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    Z probing in the wrong direction with inductive probe.

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    • Dumboundefined
      Dumbo
      last edited by

      Hi,
      I keep getting an error on Duet WiFi when trying the do bed leveling with my inductive probe Error is: G30
      Error: Z probe already triggered at start of probing move. If I cover the probe till the light comes on it well, sort of works. Getting very confused with this Gcode. How is the probe calibrated and why is it going backwards???

      Thanks guys/gals

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      • Modtcassundefined
        Modtcass
        last edited by

        You need to use the I1 command to invert the signal, refer to my first post on probe setting configuration.

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        • dc42undefined
          dc42 administrators
          last edited by

          To elaborate on that, add parameter i1 to your M558 command in config.g. Or if it already has i1, change it to i0.

          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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          • Dumboundefined
            Dumbo
            last edited by

            OK thanks guys, got the Z direction working. Now I have problems with the mesh compensation , keep crashing into x stops. The probe is working great but getting a file together without issues is a mission. Has any kind person got a file the matches my ender3 pro bed size 220 x 220, or a start file I can modify.

            Thanks

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            • TheRulesLawyerundefined
              TheRulesLawyer
              last edited by

              Do you have the bed size set correctly? Have you set the offset for your probe mount?

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              • Dumboundefined
                Dumbo
                last edited by

                Silly question were do I set bed size?

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                • Phaedruxundefined
                  Phaedrux Moderator
                  last edited by

                  It's set by the m208 command in config.g

                  Z-Bot CoreXY Build | Thingiverse Profile

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                  • Dumboundefined
                    Dumbo
                    last edited by

                    Yes that is set correctly

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                    • Dumboundefined
                      Dumbo
                      last edited by Dumbo

                      Solved my issue with bed leveling . Getting the hang of the G-codes. Just a few more questions if anyone is watching and can answer. After doing a bed level with G29 (no options) does it use the same map every time. and it seems to scrap the nozzel along the bed when goin to the start point for the print, is this in the bed .g file settings which I seem to have deleted ☹ so I would also like a starting point for rewriting the script if it is involved in my issue. Also I have calibrated the probe with the nozzel touching the bed and sent a G92 Z0 to the board and then G30 S-1 to probe the bed without resetting the Z=0 position and entered the z figure in the offset in the config file for the probe but it it still seems to low and I have to do baby steps to move it up !!. Learning and it is great fun. Thanks for the help guys/gals

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

                        @dumbo said in Z probing in the wrong direction with inductive probe.:

                        After doing a bed level with G29 (no options) does it use the same map every time

                        Yes, until you use either M562 or G29 S2 to cancel mesh bed compensation, or you power down.

                        G29 with no options also saves the height map to the SD card, so that you can use G29 S1 to reload it.

                        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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                        • TheRulesLawyerundefined
                          TheRulesLawyer
                          last edited by

                          I used to have that scraping issue sometimes as my bed was not well trammed and without the mesh it would be too close in places if you didn't give it some +z on move. To start I did the typical paper tramming, but then used the mesh visualization to start tramming the bed better. After a few rounds of that I had much less slope in the mesh bed compensation. Then I went through the process of setting the z offset for the probe in the wiki again and I can usually print without any babystepping anymore. I also replaced my adjuster knobs with those nylon cored locknuts so they wouldn't vibrate loose and lose my settings.

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