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    Automatic Bed Leveling with Conditional Gcode Iterations

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    Gcode meta commands
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    • Kolbiundefined
      Kolbi @Phaedrux
      last edited by

      Thanks @Phaedrux, was just wondering if there was a better way to skin the cat.

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      • Phaedruxundefined
        Phaedrux Moderator
        last edited by

        I'd probably do it 3 times for good measure and then at the end probe the center of the bed with G30 to re-establish Z0. But that's just me.

        Z-Bot CoreXY Build | Thingiverse Profile

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

          @Phaedrux hehe, this is my bed.g:

          ; bed.g
          ; called to perform automatic bed compensation via G32
          ; 4 Passes performed. Reccomend 2 passes as minimum.
          
          M561                                             ; clear any bed transform
          G28 W                                            ; home
          
          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
          
          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
          
          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
          
          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
          G1 H2 Z8 F2600                                   ; raise head 4mm to ensure it is above the Z probe trigger height
          G90                                              ; back to absolute mode
          
          G1 X104 Y100 F6000                               ; put head over the centre of the bed, or wherever you want to probe
          G30                                              ; lower head, stop when probe triggered and set Z to trigger height
          
          1 Reply Last reply Reply Quote 2
          • Kolbiundefined
            Kolbi
            last edited by

            @Phaedrux A cleaner way to do it:

            ; bed.g
            ; called to perform automatic bed compensation via G32
            ; 4 Passes performed. Reccomend 2 passes as minimum.
            
            M561                                             ; clear any bed transform
            G28                                              ; home
            
            while iterations <= 3                            ; perform 4 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                                          ; back to absolute mode
            
            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  
            
            1 Reply Last reply Reply Quote 3
            • Phaedruxundefined
              Phaedrux Moderator
              last edited by

              Now you're cooking with gas!

              Z-Bot CoreXY Build | Thingiverse Profile

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

                @Kolbi

                Since you're delving into conditional gcode you could look at something like this which only continues probing if necessary. Apologize for the length of this post but I included all sub macros for completeness. homexy.g also uses a virtual tool to indicate homing is in progress to avoid unnecessary Z axis movement. In case you're wondering, the sub macros are used to reduce duplicate code and unnecessarily updating several macros.

                if !move.axes[0].homed || !move.axes[1].homed	; If the printer hasn't been homed, home it
                 M98 P"0:/sys/homeyx.g"	; home y and x
                ;
                M98 P"0:/sys/homez.g"			; always home z
                ;
                M561					; clear any bed transform
                M558 P9 H5 F120 T24000			; increase dive height incase bed is severely out of alignment
                M98 P"bed_threeScrews.g"		; perform bed tramming
                echo "Bed Tramming Cycle: 1 - Difference was " ^ move.calibration.initial.deviation ^ "mm"
                ;
                M98 P"0:/macros/Utilities/Config/bltouch_config"	; Apply default BLTouch config
                ;
                while move.calibration.initial.deviation >= 0.01	; perform additional tramming if previous deviation was over 0.01mm
                 if iterations = 5
                  abort "Too many auto tramming attempts"
                 M98 P"bed_threeScrews.g"				; perform bed tramming
                 echo "Bed Tramming Cycle: " ^ iterations + 2 ^ " - Difference was " ^ move.calibration.initial.deviation ^ "mm"
                 continue
                ;
                G28 Z							; home z
                

                bltouch_config

                M558 P9 C"^io7.in" H2 F120 T24000 	; set Z probe type to bltouch and the dive height + speeds
                ;
                M98 P"0:/macros/Utilities/Config/bltouch_offset_config"
                

                bltouch_offset_config

                ;
                ; G31 - +Z Nozzle closer to bed, -Z Nozzle further from bed
                ;
                G31 X0 Y-20.23 Z2.1 P500		; 200710 mosquito liquid
                

                bed_threeScrews.g

                G30 P0 X10 Y18 Z-99999			; probe near a front left leadscrew
                G30 P1 X10 Y300 Z-99999			; probe near a back left leadscrew
                G30 P2 X320 Y166 Z-99999 S3		; probe near a right leadscrew and level
                

                homexy.g

                ; homeyx.g
                ; called to home x and y axes
                ;
                ; 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
                ;
                M563 P9 D-1 H-1			; delete tool 9 to indicate homeall is done
                

                homex.g

                if #tools != 10	; not homeall?
                  G91              ; relative positioning
                  G1 Z5 F6000 H2   ; lift Z relative to current position
                ;
                G1 H1 X357 F6000 ; move quickly to X axis endstop and stop there (first pass)
                G1 X-5 F3600     ; go back a few mm
                G1 H1 X357 F360  ; move slowly to X axis endstop once more (second pass)
                ;
                if #tools != 10	; not homeall?
                  G1 Z-5 F6000 H2  ; lower Z again
                  G90              ; absolute positioning
                

                homez.g

                if #tools != 10	; not homeall?
                  G91			; relative positioning
                  G1 Z5 F6000 H2	; lift Z relative to current position
                  G90			; absolute positioning
                ;
                ; Home Z - inline with autolevel axis
                G1 X165 Y193 F24000	; go to middle of the bed probe point and home Z. BLTouch on right
                M558 F1200		; Set probing at faster feed rate
                G30			; quickly home Z by probing the bed
                M400			; clear buffer
                M98 P"0:/macros/Utilities/Config/bltouch_config"	; Return bltouch to defaults
                G30			; slowly home Z by probing the bed
                M400			; clear buffer
                
                Phaedruxundefined Kolbiundefined 2 Replies Last reply Reply Quote 4
                • Phaedruxundefined
                  Phaedrux Moderator @mwolter
                  last edited by

                  @mwolter Beautiful.

                  Z-Bot CoreXY Build | Thingiverse Profile

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

                    @mwolter Nice, thanks for that.

                    Being away from my printer at the moment, but I would guess the following would be a correct implementation for my dual Z setup:
                    !!! Please see my final code, this is not correct !!!

                    ; bed.g
                    M561                                                    ; clear any bed transform
                    G28                                                     ; home
                    while move.calibration.initial.deviation >= 0.01	; perform additional tramming if previous deviation was over 0.01mm
                    
                     if iterations = 5                                      ; perform 5 checks
                      abort "!!!Failed to achieve < 0.01 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 "Bed Tramming Cycle: " ^ iterations + 2 ^ " - Difference was " ^ move.calibration.initial.deviation ^ "mm"
                     continue
                    
                    ;
                    
                    mwolterundefined 1 Reply Last reply Reply Quote 0
                    • fcwiltundefined
                      fcwilt
                      last edited by fcwilt

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

                      G1 Z{move.axes[2].userPosition+20} F1200

                      Hi,

                      Why that command as opposed to G91 G1 Z20?

                      And why did you implement homing such that you could not safely use G28 X or G28 Y?

                      It would not be hard to structure it so you could.

                      Thanks.

                      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 1
                      • mwolterundefined
                        mwolter @fcwilt
                        last edited by mwolter

                        @fcwilt Using that command I can be sure it raised 20mm from the previous height. Probably overkill 🙂 It was a quick add before posting this and thought it would help with changing the magnetic bed but it makes for an odd extra movement of the bed between performing the homez and bed leveling. I'll rework the macros to utilize the virtual homeall tool to skip the unnecessary bed movement and update the macros above.

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

                          @Kolbi There are too many spaces before the G30 commands and it would cause issues. Would recommend doing one leveling pass before the while command. I haven't tested the following code but it should be close.

                          M561                                         ; clear any bed transform
                          G28                                          ; home
                          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
                          echo "Bed Tramming Cycle: 1 - Difference was " ^ move.calibration.initial.deviation ^ "mm"
                          
                          while move.calibration.initial.deviation >= 0.01	; perform additional tramming if previous deviation was over 0.01mm
                           if iterations = 5
                            abort "Too many auto tramming attempts"
                           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
                           echo "Bed Tramming Cycle: " ^ iterations + 2 ^ " - Difference was " ^ move.calibration.initial.deviation ^ "mm"
                           continue
                          G28 Z					; home z
                          
                          Kolbiundefined 1 Reply Last reply Reply Quote 0
                          • Kolbiundefined
                            Kolbi @mwolter
                            last edited by Kolbi

                            @mwolter Thanks for covering my 6, I just caught that and was typing this:
                            !!! Please see my final code, this is not correct !!!

                            ; bed.g
                            ; Called to perform automatic bed compensation via G32
                            M561                                                    ; clear any bed transform
                            G28                                                     ; home
                            
                            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
                            
                            while move.calibration.initial.deviation >= 0.01	; perform additional tramming if previous deviation was over 0.01mm
                             
                             if iterations = 5                                      ; perform 5 checks
                              abort "!!!Failed to achieve < 0.01 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 within " ^ iterations + 2 ^ " tramming cycles."
                             continue
                             
                            ;
                            
                            1 Reply Last reply Reply Quote 0
                            • Kolbiundefined
                              Kolbi
                              last edited by

                              @mwolter I guess the trailing code is not a hard requirement? By trailing code I'm referring to this:

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

                                @Kolbi nope

                                1 Reply Last reply Reply Quote 0
                                • 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
                                  
                                  1 Reply Last reply Reply Quote 0
                                  • 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 
                                    
                                    1 Reply Last reply Reply Quote 1
                                    • 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!

                                          1 Reply Last reply Reply Quote 0
                                          • 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
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