Printer bed level incositancy/ G29 not working

  • Hi All,

    After getting the BLtouch working, Thank you to those who helped me! ive now got to the point of printing but not having much luck...

    Ive set the Y trigger offset value according to the instructions and run the mesh bed level with G29 but in printing, it doesn't seem to take this into account. the area i do the trigger value calibration is correct but it won't follow the bed level profile... am i missing a Gcode to activate this in a print to offset correctly?

    Its a pretty big bed that's solid and doesn't move so it does bow a bit, thought the Duet mesh was meant to compensate...

    ; Configuration file for Duet WiFi (firmware version 3)
    ; executed by the firmware on start-up
    ; generated by RepRapFirmware Configuration Tool v3.1.4 on Mon Sep 14 2020 09:23:59 GMT+0100 (British Summer Time)
    ; General preferences
    G90                                                ; send absolute coordinates...
    M83                                                ; ...but relative extruder moves
    M550 P"XL Printer"                                 ; set printer name
    ; Network
    M552 S1                                            ; enable network
    M586 P0 S1                                         ; enable HTTP
    M586 P1 S0                                         ; disable FTP
    M586 P2 S0                                         ; disable Telnet
    ; Drives
    M569 P0 S1                                         ; physical drive 0 goes forwards
    M569 P1 S1                                         ; physical drive 1 goes forwards
    M569 P2 S1                                         ; physical drive 2 goes forwards
    M569 P7 S1                                         ; physical drive 7 goes forwards
    M584 X0 Y1:4 Z2 E3                                   ; set drive mapping
    M350 X16 Y16 Z16 E16 I1                            ; configure microstepping with interpolation
    M92 X80.00 Y80.00 Z400.00 E150.00                  ; set steps per mm
    M566 X900.00 Y900.00 Z12.00 E120.00                ; set maximum instantaneous speed changes (mm/min)
    M203 X6000.00 Y6000.00 Z180.00 E1200.00            ; set maximum speeds (mm/min)
    M201 X500.00 Y500.00 Z20.00 E250.00                ; set accelerations (mm/s^2)
    M906 X800 Y1500:1500 Z800 E800 I30                      ; set motor currents (mA) and motor idle factor in per cent
    M84 S30                                            ; Set idle timeout
    ; Axis Limits
    M208 X30 Y0 Z0 S1                                  ; set axis minima
    M208 X630 Y350 Z350 S0                             ; set axis maxima
    ; Endstops
    M574 X1 S1 P"!xstop"                               ; configure active-high endstop for low end on X via pin !xstop
    M574 Y1 S1 P"!ystop"                               ; configure active-high endstop for low end on Y via pin !ystop
    M574 Z1 S2                                         ; configure Z-probe endstop for low end on Z
    ; Z-Probe
    M950 S0 C"exp.heater7"                             ; create servo pin 0 for BLTouch
    M558 P9 C"^" H5 F120 T6000                ; set Z probe type to bltouch and the dive height + speeds
    G31 P25 X6.2 Y42 Z2.5                            ; set Z probe trigger value, offset and trigger height
    M557 X60:400 Y15:300 S75                           ; define mesh grid
    ; Heaters
    M308 S0 P"bedtemp" Y"thermistor" T100000 B4138     ; configure sensor 0 as thermistor on pin bedtemp
    M950 H0 C"bedheat" T0                              ; create bed heater output on bedheat and map it to sensor 0
    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
    M308 S1 P"e0temp" Y"thermistor" T100000 B4138      ; configure sensor 1 as thermistor on pin e0temp
    M950 H1 C"e0heat" T1                               ; create nozzle heater output on e0heat and map it to sensor 1
    M307 H1 B0 S1.00                                   ; disable bang-bang mode for heater  and set PWM limit
    M307 H7 A-1 C-1 D-1 
    ; Fans
    M950 F0 C"fan0" Q500                               ; create fan 0 on pin fan0 and set its frequency
    M106 P0 S0 H-1                                     ; set fan 0 value. Thermostatic control is turned off
    M950 F1 C"fan1" Q500                               ; create fan 1 on pin fan1 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
    M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; set voltage thresholds and actions to run on power loss

  • @ChrisF3D

    Do you want to make the Mesh Bed Comp. at the beginning of every print ?

    I so put a G29 S0 in the startcode.

    If you want to make the calibration once and only want to load the heighmap put a G29 S1 into the start code.

  • So for example i make the compensation before every print because i vary the bed temp alot.

    so my startcode in the prusa slicer is

    G90 ; use absolute coordinates
    M83 ; extruder relative mode
    M104 S[first_layer_temperature] ; set extruder temp
    M140 S[first_layer_bed_temperature] ; set bed temp
    M190 S[first_layer_bed_temperature] ; wait for bed temp
    M109 S[first_layer_temperature] ; wait for extruder temp
    G28 ; home all
    G29 S0;
    G1 Z2 F240
    G1 X2 Y10 F3000
    G1 Z0.28 F240
    G92 E0.0
    G1 Y100 E8.0 F1500.0 ; intro line
    G1 X2.3 F5000
    G1 Y10 E8 F1200.0 ; intro line
    G92 E0.0

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