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    Need to have z offset set to 0.25mm before printing

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    Tuning and tweaking
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    • vistalertundefined
      vistalert
      last edited by

      Thanks to the patience and guidance of all here I've been able to get my printer finally assembled, and run off my first prints. I find that I have to set the Z Offset to 0.25mm then I get a good bottom layer adhering to my PEI surface.

      So, when I home Z, would I just use:

      G91
      G1 H2 Z0.25
      G92 Z0
      G90

      ...or is there a magic setting somewhere that can be "set and forget", which I've missed?

      Also, after my print completes, I run my bed park script (drops the bed to maximum extent. I want to include commands in this that turn off the hotend and bed. At the moment I only found out how to just set the temps to zero. But they remain in "active" state, with temp set at zero. How do I set them so they go inactive, and temps at 0?

      Thanks
      Chris

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      • fcwiltundefined
        fcwilt
        last edited by

        Hi,

        As to your Z position issue normally Z=0 is where the nozzle is just touching the bed, when bed and hotend are at working temps.

        Are you saying that is not true for your machine?

        As to saving the current values that you appear to need the correct place is in homez.g - just as you are doing.

        To turn off both bed and hotend I have been using this:

        G10 P0 S-999 R-999	; turn extruder heater off (also sets temps to zero)
        T-1          		; deselect all tools
        
        M140 S0             ; set bed heater active temp to 0
        M140 S-999          ; turn bed heater off
        

        Frederick

        Printers: a E3D MS/TC setup and a RatRig Hybrid. Using Duet 3 hardware running 3.4.6

        vistalertundefined 1 Reply Last reply Reply Quote 0
        • vistalertundefined
          vistalert @fcwilt
          last edited by

          @fcwilt thanks for the quick reply.

          At z=1.3 I can just get a 1mm feeler gauge between bed/nozzle. The feeler gauge is just brushing the nozzle.

          My BLtouch probe Zoffset is out by 0.2 hey?

          ; Current setting form config.g for Z probe offset
          G31 P500 X-26 Y-5 Z2.255

          This Z offset was set by doing the paper grab and G30 S-1 to get probe offset, avering three reading.

          Is this what I need to tweak?

          Vetiundefined 1 Reply Last reply Reply Quote 0
          • Vetiundefined
            Veti @vistalert
            last edited by

            @vistalert

            the manual measuring is just to get you close, then fine tune with babystepping until you get a good first layer and adjust the offset by the babystepping amount.

            vistalertundefined 1 Reply Last reply Reply Quote 0
            • vistalertundefined
              vistalert @Veti
              last edited by

              @Veti - awesome. Should I subtract 0.2mm from the Z Offset in config.g?

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              • Vetiundefined
                Veti
                last edited by Veti

                subtracting from the offset puts the nozzle further away
                adding puts the nozzle closer
                (hope i got that right, one of the things i always get confused by)

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                • vistalertundefined
                  vistalert
                  last edited by vistalert

                  @Veti haha yep that's why I asked you coz I'm confused too. I can try it out. Will let you know.

                  vistalertundefined 1 Reply Last reply Reply Quote 0
                  • vistalertundefined
                    vistalert @vistalert
                    last edited by

                    Thanks every one - dropping the Zoffset slightly, in config.g has brought the nozzle spot on to 1mm from the bed with Z=1.

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