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    Help setting probing limits

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    • singhm29undefined
      singhm29
      last edited by

      Wondering if anyone has some good recommendations for how best to maximize the probing for my particular situation.

      Print head can travel on the
      -X axis from 0 to 607mm
      -Y axis from 0 to 603mm
      163ffe7b-5109-4561-bb46-6870eb7c7dbe-image.png

      I am using a Bltouch mounted just infront of my hotend and the probe remains above print surface in a smaller range of anything past this range and it may try probing off the bed
      -X axis from 5 to 600mm
      -Y axis from 47 to 603mm
      d268051a-bbb0-411f-a332-37f4b6833474-image.png

      I have tried a few different spacing options but they all seem to not take the Bltouch to the absolute edge which I have defined in the second image

      ; Axis Limits
      M208 X0 Y0 Z0 S1 ; set axis minima
      M208 X607 Y603 Z578.5 S0 ; set axis maxima
      M208 X0:607 Y0:603 ; max movement allowed

      M557 X5:600 Y47:603 S20

      Any thoughts would be much appreciated!

      1 Reply Last reply Reply Quote 0
      • Phaedruxundefined
        Phaedrux Moderator
        last edited by

        Post your full config.

        @singhm29 said in Help setting probing limits:

        but they all seem to not take the Bltouch to the absolute edge

        You mean the BLTouch isn't as close the front edge as you expect it to be? Use a ruler to measure how far away it is and adjust that distance to your M557 Y minima.

        Z-Bot CoreXY Build | Thingiverse Profile

        1 Reply Last reply Reply Quote 0
        • singhm29undefined
          singhm29
          last edited by

          ; Configuration file for Duet 3 (firmware version 3)
          ; executed by the firmware on start-up
          ;
          ; generated by RepRapFirmware Configuration Tool v3.2.0 on Wed Jan 06 2021 20:53:06 GMT-0500 (Eastern Standard Time)
          
          ; General preferences
          G90                                          ; send absolute coordinates...
          M83                                          ; ...but relative extruder moves
          M550 P"Gigabot"                           ; set printer name
          
          ; Network
          M552 P0.0.0.0 S1                             ; enable network and acquire dynamic address via DHCP
          M586 P0 S1                                   ; enable HTTP
          M586 P1 S0                                   ; disable FTP
          M586 P2 S0                                   ; disable Telnet
          
          ; Drives
          M569 P0.0 S1                                 ; physical drive 0.0 goes forwards
          M569 P0.1 S0                                 ; physical drive 0.1 goes backwards
          M569 P0.2 S1                                 ; physical drive 0.2 goes forwards
          M569 P0.3 S1                                 ; physical drive 0.3 goes forwards
          M569 P0.4 S1                                 ; physical drive 0.4 goes forwards
          
          M584 X0.0 Y0.1 Z0.2:0.4 E0.3                 ; set drive mapping
          M671 X-109:707 Y300:300 S1.0 ; leadscrews at left (connected to Z) and right (connected to E1) of X CHANGE AFTER FIGURE OUT POSITION OF BL ON MOUNT/limits
          
          M350 X16 Y16 Z16 E16 I1                      ; configure microstepping with interpolation
          M92 X59.26 Y59.26 Z2015.50 E420.00           ; set steps per mm
          M566 X900.00 Y900.00 Z60.00 E7000.00          ; set maximum instantaneous speed changes (mm/min)
          M203 X6000.00 Y6000.00 Z180.00 E7000.00      ; set maximum speeds (mm/min)
          M201 X500.00 Y500.00 Z20.00 E250.00          ; set accelerations (mm/s^2)
          M906 X950 Y1900 Z950:950 E800 I30                ; set motor currents (mA) and motor idle factor in per cent
          M84 S30                                      ; Set idle timeout
          
          ; Axis Limits
          M208 X0 Y0 Z0 S1                             ; set axis minima
          M208 X607 Y603 Z578.5 S0                       ; set axis maxima
          M208 X0:607 Y0:603 ; max movement allowed
           
          ; Endstops
          M574 X1 S1 P"!io0.in"                        ; configure active-high endstop for low end on X via pin !io0.in
          M574 Y2 S1 P"!io1.in"                        ; configure active-high endstop for high end on Y via pin !io1.in
          
          ; Z-Probe
          M950 S0 C"io7.out"                           ; create servo pin 0 for BLTouch
          M558 P9 C"^io7.in" H5 F120 T6000             ; set Z probe type to bltouch and the dive height + speeds
          G31 P25 X-5 Y48 Z2.5                        ; set Z probe trigger value, offset and trigger height
          M557 X5:600 Y47:603 S40                     ; define mesh grid 
          
          ; Heaters
          ;Bed heater config
          M308 S0 P"temp0" Y"thermistor" T100000 B4138 A"Heated bed"; configure sensor 0 as thermistor on pin temp0
          M950 H0 C"out0" T0                           ; create bed heater output on out0 and map it to sensor 0
          M307 H0 R0.418 C453.0 D4.22 S1.00 V23.9
          M307 H0 B1 S1.00                             ; enable bang-bang mode for the bed heater and set PWM limit
          M140 H0                                      ; map heated bed to heater 0
          M143 H0 S120                                 ; set temperature limit for heater 0 to 120C
          
          ;Hotend heater config
          ;M308 S1 P"temp1" Y"pt1000" A"PT1000"      ; configure sensor 1 as thermocouple via CS pin spi.cs1 PT1000 code
          ;M950 H1 C"out1" T1                           ; create nozzle heater output on out1 and map it to sensor 1 PT1000 code
          M308 S1 P"spi.cs0" Y"rtd-max31865" A"PT100"      ; configure sensor 1 as thermocouple via CS pin spi.cs1 CODE FOR PT100
          M950 H1 C"out1" T1                           ; create nozzle heater output on out1 and map it to sensor 1 CODE FOR PT100
          M307 H1 B0 S1.00                             ; disable bang-bang mode for heater  and set PWM limit
          M143 H1 S450                                 ; set temperature limit for heater 1 to 450C
          
          ; Fans
          M950 F0 C"out7" Q500                       ; create fan 0 on pin out4 and set its frequency
          M106 P0 S0 H-1                               ; set fan 0 value. Thermostatic control is turned off
          M950 F1 C"out8" Q500                   ; create fan 1 on pin out5 and set its frequency
          M106 P1 S1 H1 T45                            ; set fan 1 value. Thermostatic control is turned on
          
          ; Tools
          M563 P0 D0 H1 F0                             ; define tool 0
          G10 P0 X0 Y0 Z0                              ; set tool 0 axis offsets
          G10 P0 R0 S0                                 ; set initial tool 0 active and standby temperatures to 0C
          
          ; Custom settings are not defined
          
          ; Miscellaneous
          T0                                           ; select first tool
          
          
          

          Tried S=50 and S=40 this morning and this is how the bounds changed.

          3b50d349-6fca-4ed5-86d5-5f465f222c2c-image.png

          @Phaedrux said in Help setting probing limits:

          Post your full config.

          @singhm29 said in Help setting probing limits:

          but they all seem to not take the Bltouch to the absolute edge

          You mean the BLTouch isn't as close the front edge as you expect it to be? Use a ruler to measure how far away it is and adjust that distance to your M557 Y minima.

          With S40 its perfectly at the front edge but then the back edge suffers and the last row of probing is almost 125mm away. Are you thinking I keep my max travel distances the same but change my min and max? Would that not mess up what homing value is loaded?

          DIY-O-Sphereundefined 1 Reply Last reply Reply Quote 0
          • DIY-O-Sphereundefined
            DIY-O-Sphere @singhm29
            last edited by

            @singhm29
            In M557 also a P parameter is available.
            Witch in my opinion is the easier way to define the mesh grid.
            So in you case M557 X5:600 Y47:603 P10:10 as a suggestion
            The grid than will be calculated for 10x10 points and the machine will drive to the set limits.

            (UTC+1)

            1 Reply Last reply Reply Quote 2
            • singhm29undefined
              singhm29
              last edited by

              @DIY-O-Sphere said in Help setting probing limits:

              M557

              That sounds perfect! Thank you for pointing me in the right direction

              1 Reply Last reply Reply Quote 0
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