Problem using bed leveling



  • Hello guys, been at this for 3 days and can't make it out.

    I've set up a Ender 3 Pro with a Duet 3 6HC. (Cartesian)

    Using a Escher 3D Mini IR Probe.

    activated probe, works well. I get a fairly decent height map. (max difference is .2mm)

    But for some reason, when I print, I cannot get the print to be level all the way around. Like the print doesn't compensate for the heightmap differences.

    I have my homeall.g set as:

    G91 ; relative mode
    G1 H2 Z4 F200 ; raise head 4mm
    G1 H1 X-250 Y-240 F3000 ; move up to 250mm in the -X and -Y directions until the homing switches are triggered
    G1 H2 X4 Y4 F600; move slowly 6mm in +X and +Y directions
    G1 H1 X-10 Y-10 ; move up to 10mm in the -X and -Y directions until the homing switches are triggered
    G90 ; back to absolute mode
    G1 X118 Y118 F3000 ; 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
    G29 S1
    ; Uncomment the following lines to lift Z after probing
    G91 ; relative positioning
    G1 Z2.5 F150 ; lift Z relative to current position
    G90 ; absolute positioning

    My prints (using Prusa Slicer) has a G28 in the start gcode to homeall. The G29 S1 is in the homeall.g

    I made a test print of 9 circles and they seem to be like the height map. I have a good one, and some others are too squished, some are too high. Same thing as if it ignores the height map. I thought it was supposed to compensate and make the prints all the same height at different spots on the bed? On the original card, I had Manual mesh bed levelling and it worked fairly well (much better than what I have now).

    Any pointers?

    Oh, using:
    Duet 3 6HC
    Escher 3D mini IR probe
    Firmware 3.01RC10
    DWC 2.1.5

    You can see in the attache picture that the front ones are super squished, the back ones are ok. IMG_3405.jpeg



  • Screen Shot 2020-04-30 at 3.52.03 PM.png

    Here's my height map if that helps..


  • Moderator

    I suspect that your bed surface isn't playing nice with the IR probe. It could be the white speckle pattern. Try putting a sheet of matte paper on the surface and re probing the mesh. The glass should be much flatter than that.



  • I tried to probe without the glass on and it is all super straight (all green) so yes, my glass (Creality glass) is causing a weird pattern.

    But still, shouldn't my printer compensate for these differences?

    I'm seeing the exact same issue that this user does:

    https://forum.duet3d.com/topic/16030/mesh-bed-levelling-with-bltouch-am-i-doing-something-wrong/6

    Just in case, here's my bed.g, homeall.g, config.g, config-override.g

    ; bed.g
    ; called to perform automatic bed compensation via G32
    ;
    ; generated by RepRapFirmware Configuration Tool v2.1.8 on Wed Apr 29 2020 20:50:30 GMT-0400 (EDT)
    M561 ; clear any bed transform
    G29  ; probe the bed and enable compensation
    
    
    ; Configuration file for Duet 3 (firmware version 3)
    ; executed by the firmware on start-up
    ;
    ; generated by RepRapFirmware Configuration Tool v2.1.8 on Wed Apr 29 2020 20:50:30 GMT-0400 (EDT)
    
    ; General preferences
    G90                                                ; send absolute coordinates...
    M83                                                ; ...but relative extruder moves
    M550 P"Ender 3 Pro"                                ; set printer name
    M918 P1 E4 F2000000                                ; configure direct-connect display
    
    ; 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 S0                                       ; physical drive 0.0 goes backwards
    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
    M584 X0.0 Y0.1 Z0.2 E0.3                           ; set drive mapping
    M350 X16 Y16 Z16 E16 I1                            ; configure microstepping with interpolation
    M92 X80.00 Y80.00 Z400.00 E130.00                  ; set steps per mm
    M566 X1200.00 Y1200.00 Z24.00 E300.00              ; set maximum instantaneous speed changes (mm/min)
    M203 X9000.00 Y9000.00 Z180.00 E6000.00            ; set maximum speeds (mm/min)
    M201 X500.00 Y500.00 Z100.00 E5000.00              ; set accelerations (mm/s^2)
    M906 X800 Y800 Z800 E1000 I50                      ; 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 X245 Y225 Z230 S0                             ; set axis maxima
    
    ; Endstops
    M574 X1 S1 P"io0.in"                               ; configure active-high endstop for low end on X via pin io0.in
    M574 Y1 S1 P"io1.in"                               ; configure active-high endstop for low end on Y via pin io1.in
    M574 Z1 S1 P"io2.in"                               ; configure active-high endstop for low end on Z via pin io2.in
    
    ; Z-Probe
    M558 P1 C"io6.in+io6.out" H2.5 F100 T9000          ; set Z probe type to unmodulated and the dive height + speeds
    G31 P500 X-22 Y4 Z2.92                             ; set Z probe trigger value, offset and trigger height
    M557 X10:245 Y15:225 P5                            ; define mesh grid
    
    ; Heaters
    M308 S0 P"temp1" Y"thermistor" T100000 B4092       ; configure sensor 0 as thermistor on pin temp1
    M950 H0 C"out0" T0                                 ; create bed heater output on out0 and map it to sensor 0
    M143 H0 S120                                       ; set temperature limit for heater 0 to 120C
    M307 H0 B0 S1.00                                   ; disable bang-bang mode for the bed heater and set PWM limit
    M140 H0                                            ; map heated bed to heater 0
    M308 S1 P"temp0" Y"thermistor" T100000 B4092       ; configure sensor 1 as thermistor on pin temp0
    M950 H1 C"out1" T1                                 ; create nozzle heater output on out1 and map it to sensor 1
    M143 H1 S270                                       ; set temperature limit for heater 1 to 270C
    M307 H1 B0 S1.00                                   ; disable bang-bang mode for heater  and set PWM limit
    
    ; Fans
    M950 F0 C"out7" Q500                               ; create fan 0 on pin out7 and set its frequency
    M106 P0 S1 H1 T45                                  ; set fan 0 value. Thermostatic control is turned on
    M950 F1 C"out8" Q500                               ; create fan 1 on pin out8 and set its frequency
    M106 P1 S1 H-1                                     ; set fan 1 value. Thermostatic control is turned off
    
    ; Tools
    M563 P0 D0 H1 F-1                                  ; 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
    M501                                               ; Load heaters config
    M591 D0 P5 C"io5.in" R40:120 E3 S0 A0             ; Enable and set Filament monitor
    
    ; 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
    T0                                                 ; select first tool
    
    
    
    ; config-override.g file generated in response to M500 at 2020-04-29 14:51
    ; This is a system-generated file - do not edit
    ; Heater model parameters
    M307 H0 A111.8 C595.1 D0.2 S1.00 V24.1 B0
    M307 H1 A372.6 C119.7 D4.4 S1.00 V24.2 B0
    ; Workplace coordinates
    G10 L2 P1 X0.00 Y0.00 Z0.00
    G10 L2 P2 X0.00 Y0.00 Z0.00
    G10 L2 P3 X0.00 Y0.00 Z0.00
    G10 L2 P4 X0.00 Y0.00 Z0.00
    G10 L2 P5 X0.00 Y0.00 Z0.00
    G10 L2 P6 X0.00 Y0.00 Z0.00
    G10 L2 P7 X0.00 Y0.00 Z0.00
    G10 L2 P8 X0.00 Y0.00 Z0.00
    G10 L2 P9 X0.00 Y0.00 Z0.00
    
    
    ; homeall.g
    ; called to home all axes
    ;
    ; generated by RepRapFirmware Configuration Tool v2.1.8 on Wed Apr 29 2020 20:50:30 GMT-0400 (EDT)
    
    G91 ; relative mode
    G1 H2 Z4 F200 ; raise head 4mm
    G1 H1 X-250 Y-240 F3000 ; move up to 250mm in the -X and -Y directions until the homing switches are triggered
    G1 H2 X4 Y4 F600; move slowly 6mm in +X and +Y directions
    G1 H1 X-10 Y-10 ; move up to 10mm in the -X and -Y directions until the homing switches are triggered
    G90 ; back to absolute mode
    G1 X118 Y118 F3000 ; 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
    G29 S1
    ; Uncomment the following lines to lift Z after probing
    G91                    ; relative positioning
    G1 Z2.5 F150           ; lift Z relative to current position
    G90                    ; absolute positioning
    
    
    

  • Moderator

    @Thalios said in Problem using bed leveling:

    I tried to probe without the glass on and it is all super straight (all green) so yes, my glass (Creality glass) is causing a weird pattern.
    But still, shouldn't my printer compensate for these differences?

    If the glass is preventing it from getting an accurate reading of the surface how can it compensate for the actual surface?



  • I till sand down the speckled face after dinner and repaint it black then report back! thanks


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