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    Automatic Bed Leveling with Conditional Gcode Iterations

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    • Phaedruxundefined
      Phaedrux Moderator @mwolter
      last edited by

      @mwolter Beautiful.

      Z-Bot CoreXY Build | Thingiverse Profile

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      • 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 ๐Ÿ™‚ 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
                 
                ;
                
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                • 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

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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
                            Itโ€™s just a different way of doing it and like I mentioned, this way I can be sure itโ€™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
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