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    Nozzle offset with bltouch?

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    • tonypundefined
      tonyp
      last edited by

      Soo... I've just got round to configuring my duet coming over from marlin. I'm struggling with my bltouch and nozzle offset. Basically the nozzle is scraping the bed. I've set the prop trigger height but as my bltouch mount is printed I suspect I need an offset from the bed to the nozzle? so it goes X below the triggered height? Can you advise on how I determine this and the correct G-Codes to set it?

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      • PaulHewundefined
        PaulHew
        last edited by

        Hi,

        Have you seen this document?
        https://duet3d.dozuki.com/Wiki/Test_and_calibrate_the_Z_probe

        Helped me loads

        HTH Paul.

        RailCore II - Duet Mini + 1LC, Voron V0.1 - Duet Mini
        Voron 2.4 disassembled..... Waiting for the RailCore Mini....

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        • tonypundefined
          tonyp
          last edited by

          Thanks Paul, I have and I’ve set the trigger height. No difference, driving me a little mad 😬. I just want to be able to print! 🤣

          Someone has suggested changing the trigger height to offset the nozzle, but this doesn’t seem natural to me

          Phaedruxundefined 1 Reply Last reply Reply Quote 0
          • JamesMundefined
            JamesM
            last edited by

            When I set up and calibrate my BL-touch I use a certain piece of paper between the nozzle and the print bed when setting my zero Z-height....basically building in a nozzle offset. Then I do the z-probe tests and set the BL-Touch trigger height in the config. Then it's just a few test prints, usually just on a skirt around a print to fine tune the bl-touch trigger height that last few .05 mm.

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            • Phaedruxundefined
              Phaedrux Moderator @tonyp
              last edited by

              @tonyp Can you post your config files and homing files? It's hard to suggest anything without seeing what's actually going on.

              Z-Bot CoreXY Build | Thingiverse Profile

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              • tonypundefined
                tonyp
                last edited by

                Sure, see attached
                0_1559344561723_bed.g
                0_1559344569108_config.g
                0_1559344590705_homeall.g
                0_1559344604658_homez.g

                Any suggestions welcome, still getting my head around G-Codes.

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                • Phaedruxundefined
                  Phaedrux Moderator
                  last edited by

                  G31 P25 X42 Y-4 Z0.321

                  Your trigger height seems abnormally low for the BLTouch. When installed correctly it should be closer to 2mm. The BLTouch instructions say that it should be installed so that the base of the probe body should be 8mm above the nozzle tip.

                  M558 P9 H2.5 F60 T6000

                  The dive height of 2.5mm is a little low. Start with 5mm to start with.

                  G1 X-47.5 Y14 F6000    ; go to first bed probe point and home Z
                  G30    ; home Z by probing the bed
                  

                  The coordinates of your probe point seem a little odd. You should try to place the probe in the center of the bed for best results.

                  Z-Bot CoreXY Build | Thingiverse Profile

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                  • tonypundefined
                    tonyp
                    last edited by

                    Thanks, I had just went through the doc https://duet3d.dozuki.com/Wiki/Test_and_calibrate_the_Z_probe zeroed the probe, then set the trigger height of 0.140 as tested 5 times I had done it previously without the zeroing :|. I am thinking of offsetting the trigger height to a middle ground of 0.250 as a test since with 0.140 the nozzle is way to far of the bed now.

                    I've measured by putting the tip onto the bed, then using verniers measure the distance between the bed and the flat base of the BLTouch and that is 8.32 (docs say 8-8.5).

                    Can you explain the Dive height a little more sorry 😕

                    They sure are odd, I've converted an Ender 3 into a duet/titan areo direct extruder as per attached photo of the head setup
                    0_1559391000921_-qRIMlI2S3uO5-61H3OzYQ.jpg

                    Phaedruxundefined 1 Reply Last reply Reply Quote 0
                    • Phaedruxundefined
                      Phaedrux Moderator @tonyp
                      last edited by Phaedrux

                      @tonyp said in Nozzle offset with bltouch?:

                      I had just went through the doc https://duet3d.dozuki.com/Wiki/Test_and_calibrate_the_Z_probe zeroed the probe,

                      Question: When you are testing the trigger height, are you moving the probe to over the same XY coordinate as where the nozzle tip was when you zero it?

                      @tonyp said in Nozzle offset with bltouch?:

                      Can you explain the Dive height

                      Dive height refers to the z height that the print head will move to before a probing move. It needs to be high enough to allow the BLTouch pin to drop down and settle completely before making contact with the bed.

                      Z-Bot CoreXY Build | Thingiverse Profile

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