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    Automatic Bed Leveling with Conditional Gcode Iterations

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    • mwolterundefined
      mwolter @Kolbi
      last edited by

      @Kolbi nope

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      • mwolterundefined
        mwolter
        last edited by mwolter

        Removed the following and added it to homeall.g since I typically do a home all before changing the bed.

        G1 Z{move.axes[2].userPosition+20} F1200		; move z up 20mm for magnetic bed replacement
        

        homeall.g

        ; homeall.g
        ; called to home all axes (G28)
        ;
        ; Warning: do not home individual axes by calling G28 X or G28 Y. It will cause errors. Instead run the macro file directly. IE M98 P"0:/sys/homex.g"
        ;
        M563 P9 S"HomeAll"		; create tool 9 to indicate homeall is in progress
        ;
        G91              		; relative positioning
        G1 Z5 F6000 H2   		; lift Z relative to current position
        M98 P"0:/sys/homey.g"	; home y
        M98 P"0:/sys/homex.g"	; home x
        G90             		; absolute positioning
        ;
        M98 P"0:/sys/homez.g"	; home z
        ;
        M563 P9 D-1 H-1			; delete tool 9 to indicate homeall is done
        ;
        G1 Z{move.axes[2].userPosition+50} F1200		; move z up 50mm for magnetic bed replacement
        
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        • Kolbiundefined
          Kolbi
          last edited by Kolbi

          Thanks @mwolter!

          For brevity, here is my final working version:

          ; bed.g
          ; Called to perform automatic bed compensation via G32
          
          M561                                                      ; Clear any bed transform
          G28                                                       ; Home
          
          while iterations <=1                                      ; Do minimum of 2 passes
             G30 P0 X25 Y100 Z-99999                                ; Probe near a leadscrew, half way along Y axis
             G30 P1 X235 Y100 Z-99999 S2                            ; Probe near a leadscrew and calibrate 2 motors
             G90
          
          while move.calibration.initial.deviation >= 0.002         ; perform additional tramming if previous deviation was over 0.002mm 
             if iterations = 5                                      ; Perform 5 checks
                M300 S3000 P500                                     ; Sound alert, required deviation could not be achieved
                abort "!!! ABORTED !!! Failed to achieve < 0.002 deviation within 5 movements. Current deviation is " ^ move.calibration.initial.deviation ^ "mm."
             G30 P0 X25 Y100 Z-99999                                ; Probe near a leadscrew, half way along Y axis
             G30 P1 X235 Y100 Z-99999 S2                            ; Probe near a leadscrew and calibrate 2 motors
             G90                                                    ; Back to absolute mode
          
          echo "Gantry deviation of " ^ move.calibration.initial.deviation ^ "mm obtained."
          G1 H2 Z8 F2600                                            ; Raise head 8mm to ensure it is above the Z probe trigger height
          G1 X104 Y100 F6000                                        ; Put head over the centre of the bed, or wherever you want to probe
          G30 
          
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          • fcwiltundefined
            fcwilt @mwolter
            last edited by

            @mwolter said in Automatic Bed Leveling with Conditional Gcode Iterations:

            @fcwilt Using that command I can be sure it raised 20mm from the previous height.

            Hi,

            Thanks for the reply.

            Why do you think G91 G1 Z20 doesn't do that same thing?

            Frederick

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

            mwolterundefined 1 Reply Last reply Reply Quote 0
            • mwolterundefined
              mwolter @fcwilt
              last edited by

              @fcwilt
              It’s just a different way of doing it and like I mentioned, this way I can be sure it’s raised 20mm from its current position. The G30 command actually sets Z to about 3m. So G1 Z20 will only raise Z by 17mm.

              fcwiltundefined 1 Reply Last reply Reply Quote 0
              • Kolbiundefined
                Kolbi @Phaedrux
                last edited by

                @Phaedrux said in Automatic Bed Leveling with Conditional Gcode Iterations:

                Now you're cooking with gas!

                Definitely cooking with gas now!

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                • fcwiltundefined
                  fcwilt @mwolter
                  last edited by fcwilt

                  @mwolter said in Automatic Bed Leveling with Conditional Gcode Iterations:
                  The G30 command actually sets Z to about 3m. So G1 Z20 will only raise Z by 17mm.

                  I think you will find that a G91 G1 Z20 will raise Z by 20 unless it doesn't have that much room left on the axis.

                  If a G30 sets Z to 3 then a G91 G1 Z20 will take Z to 23.

                  At least that is my experience.

                  Good luck.

                  Frederick

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

                  mwolterundefined Phaedruxundefined 2 Replies Last reply Reply Quote 1
                  • mwolterundefined
                    mwolter @fcwilt
                    last edited by

                    This post is deleted!
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                    • Phaedruxundefined
                      Phaedrux Moderator @fcwilt
                      last edited by

                      @fcwilt said in Automatic Bed Leveling with Conditional Gcode Iterations:

                      I think you will find that a G91 G1 Z20 will raise Z by 20 unless it doesn't have that much room left of the axis.

                      Correct. G90 moves to an absolute point, G91 is relative to the current position.

                      https://duet3d.dozuki.com/Wiki/Gcode#Section_G90_Set_to_Absolute_Positioning

                      Z-Bot CoreXY Build | Thingiverse Profile

                      mwolterundefined 1 Reply Last reply Reply Quote 1
                      • mwolterundefined
                        mwolter @Phaedrux
                        last edited by

                        @Phaedrux If the command G90 G1 Z20 is used in one line, does G91 have to be used to return to absolute mode?

                        Phaedruxundefined A Former User? fcwiltundefined 3 Replies Last reply Reply Quote 1
                        • Phaedruxundefined
                          Phaedrux Moderator @mwolter
                          last edited by

                          @mwolter That's a good question, and I'm not sure off the top of my head. Would have to test to see if it sticks in that format or not.

                          Z-Bot CoreXY Build | Thingiverse Profile

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                          • Kolbiundefined
                            Kolbi
                            last edited by

                            Another thing I noticed is repeatability with PindaV2 probe is not as consistent as BLTouchV3.1... So being that I use a bondtech bmg mosquito, I've made this modified version to scrap the Pinda and welcome the BLTouch. Will get it sorted on the printer and test it fully this weekend.
                            BMGm-BLTouch.JPG BMGm-BLTouch-Actual.jpg

                            mwolterundefined 1 Reply Last reply Reply Quote 0
                            • mwolterundefined
                              mwolter @Kolbi
                              last edited by

                              @Kolbi looks good! Is that SLS or MJF printed?

                              Kolbiundefined 1 Reply Last reply Reply Quote 0
                              • Kolbiundefined
                                Kolbi @mwolter
                                last edited by Kolbi

                                @mwolter It was done on an HP Multijet Fusion (MJF), using Nylon PA12.

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                                • A Former User?
                                  A Former User @mwolter
                                  last edited by

                                  @mwolter said in Automatic Bed Leveling with Conditional Gcode Iterations:

                                  If the command G90 G1 Z20 is used in one line, does G91 have to be used to return to absolute mode?

                                  yes, g-code knows nothing about white space or line breaks

                                  (optionally you can use push and pop, M120, M121)

                                  Kolbiundefined 1 Reply Last reply Reply Quote 1
                                  • fcwiltundefined
                                    fcwilt @mwolter
                                    last edited by

                                    @mwolter said in Automatic Bed Leveling with Conditional Gcode Iterations:

                                    @Phaedrux If the command G90 G1 Z20 is used in one line, does G91 have to be used to return to absolute mode?

                                    G90 is absolute, G91 is relative.

                                    Frederick

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

                                    mwolterundefined 1 Reply Last reply Reply Quote 0
                                    • mwolterundefined
                                      mwolter @fcwilt
                                      last edited by

                                      @fcwilt
                                      That’s why I used that command. Pulled that command from another macro and couldn’t remember why it was created. It’s used to move some amount from the current position without needing to bounce back and forth from absolute to relative and back to absolute positioning.

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

                                        @mwolter said in Automatic Bed Leveling with Conditional Gcode Iterations:

                                        @fcwilt
                                        That’s why I used that command. Pulled that command from another macro and couldn’t remember why it was created. It’s used to move some amount from the current position without needing to bounce back and forth from absolute to relative and back to absolute positioning.

                                        But there is no reason not to make use of the two positioning modes, there is no downside to using them.

                                        There is nothing to be gained by emulating relative mode using the object model as you are doing.

                                        Frederick

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

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                                        • Kolbiundefined
                                          Kolbi @A Former User
                                          last edited by

                                          @bearer said in Automatic Bed Leveling with Conditional Gcode Iterations:

                                          optionally you can use push and pop, M120, M121

                                          @bearer I read the gcode manual but these two functions still made little sense to me - best I can derive is a save state / restore state? Could you expand a little on these and give me some use examples?

                                          Many thanks,
                                          Kolbi

                                          A Former User? 1 Reply Last reply Reply Quote 0
                                          • A Former User?
                                            A Former User @Kolbi
                                            last edited by

                                            @Kolbi does https://forum.duet3d.com/topic/17854/retrieve-the-position-of-an-axis/5?_=1596130135808 help?

                                            Kolbiundefined 1 Reply Last reply Reply Quote 0
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