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    Adjusting Z-offset in config?

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    • westechundefined
      westech
      last edited by

      This always confused me. I just used baby steps to adjust my first layer. -0.45.

      My config has my Z-offset as Z2.18. So, do I add 0.45 + 2.18 or subtract 0.45-2.18?

      My baby steps lowered the nozzle, but the z offset is the distance between the BL touch trigger and the nozzle. ?

      Thanks.

      fcwiltundefined Stephen6309undefined 2 Replies Last reply Reply Quote 0
      • fcwiltundefined
        fcwilt @westech
        last edited by fcwilt

        @westech said in Adjusting Z-offset in config?:

        This always confused me. I just used baby steps to adjust my first layer. -0.45.

        My config has my Z-offset as Z2.18. So, do I add 0.45 + 2.18 or subtract 0.45-2.18?

        My baby steps lowered the nozzle, but the z offset is the distance between the BL touch trigger and the nozzle. ?

        Thanks.

        The Z Trigger Height parameter for the Z probe is the value that is assigned to the logical Z position when the probe triggers.

        A BLTouch probe is going to be within a few mm's of the bed when it triggers but Z Trigger Height parameter could be set to 10,000 and the firmware would happily set the logical Z position to 10,000 - which is clearly nonsensical.

        The firmware is "trusting" that the Z Trigger Height parameter is the correct value.

        If when you jog to Z=0 and you end up not touching the bed the Z Trigger Height parameter is too small.

        On the other hand if you run into the bed while jogging to Z=0 then the Z Trigger Height parameter is too large.

        You take whatever the value is from baby-stepping and subtract it from Z Trigger Height parameter. Of course subtracting a negative number is the same as adding the absolute value of the negative number.

        Frederick

        Printers: A FT-5 with the 713 upgrade bits, a custom MarkForged style, a small Utilmaker style, a small CoreXY from kit and a E3D MS/TC setup. Various hotends. Using Duets (2 and 3) running 3.4.6

        1 Reply Last reply Reply Quote 1
        • westechundefined
          westech
          last edited by

          That answers the confusing part. I added 0.45 to 2.18 = 2.63. And that seemed to work. You have to disregard the negative number.

          Thanks

          fcwiltundefined 1 Reply Last reply Reply Quote 0
          • fcwiltundefined
            fcwilt @westech
            last edited by

            @westech said in Adjusting Z-offset in config?:

            That answers the confusing part. I added 0.45 to 2.18 = 2.63. And that seemed to work. You have to disregard the negative number.

            Thanks

            Or you can always just subtract the actual number displayed by the baby-stepping, regardless of the sign of the value. The result will be correct.

            Frederick

            Printers: A FT-5 with the 713 upgrade bits, a custom MarkForged style, a small Utilmaker style, a small CoreXY from kit and a E3D MS/TC setup. Various hotends. Using Duets (2 and 3) running 3.4.6

            1 Reply Last reply Reply Quote 0
            • Stephen6309undefined
              Stephen6309 @westech
              last edited by

              @westech Increasing the Z offset gets it closer to the bed, decreasing is farther away. I added this as a comment the the G31, so I wouldn't forget.

              1 Reply Last reply Reply Quote 3
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