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    Automatic Bed Leveling with Conditional Gcode Iterations

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    Gcode meta commands
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    • Phaedruxundefined
      Phaedrux Moderator
      last edited by

      If that did work, I don't think it would be more accurate. Plus I don't think that would work as expected.

      Doubling up the passes in bed.g isn't uncommon. It will really depend on how out of true the tilt is and how close to the lead screws you can probe.

      Z-Bot CoreXY Build | Thingiverse Profile

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

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

        1 Reply Last reply Reply Quote 0
        • 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
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