Dual z axis, G32, z axis off level



  • Hello,

    After G32 command the nozzle at the beginning of the x axis is +0.05 off the bed and at the end of the x axis is -0.10

    Mesh bed leveling sees the gantry sag before G32. After the G32 command it does not see the sag but it's there.

    I'm using Ender 3
    left leadscrew is 30mm to the left of the nozzle x0
    right leadscrew is 30mm to the right of the nozzle x230 (axis limit)

    Here is my related config.g

    ;dual z axis limits                             
    M671 X-30:260 Y0:0 S2                        ; leadscrews at left (connected to Z) and right (connected to E1) of X axis
    ;M208 X10:190 Y30:230                            ; X carriage moves from -5 to 205, Y bed goes from 0 to 200
    
    ; Axis Limits
    M208 X0 Y0 Z0 S1                               ; set axis minima
    M208 X230 Y230 Z230 S0                         ; set axis maxima
    
    ; Z-Probe PINDA
    M558 P5 C"probe" H3 F300 T6000 A20 S0.005     ; PINDA
    ;M308 S2 P"e1temp" A"PINDA" Y"thermistor" T100000 B3950 ; PINDA TEMP OK
    G31 P1000 X-41 Y23 Z0.9
    ;G31 P100 X-41 Y23 Z0.585
    M557 Y45:195 X30:185 P9                        ; define mesh grid OK
    
    ; Tools
    M563 P0 D0 H1 F0                               ; define tool 0
    ;G10 P0 X0 Y13 Z-0.80                                ; set tool 0 axis offsets
    G10 P0 X0 Y13 Z0                                ; set tool 0 axis offsets
    G10 P0 R0 S0                                   ; set initial tool 0 active and standby temperatures to 0C 
    

    and my bed.g

    G30 P0 X18 Y115 Z-99999 ; probe near a leadscrew, half way along Y axis
    G30 P1 X210 Y115 Z-99999 S2 ; probe near a leadscrew and calibrate 2 motors
    G28 Z
    

    Where are my mistakes?


  • Moderator

    @rudenick

    As it looks like the correction is going the wrong direction, make sure the left leadscrew motor is plugged into Z and right to E1, and your M584 should be M584 Z2:4 (rather than Z4:2). The order it is defined matters!

    Looks like your leadscrews are in the middle of the bed in Y, so change M671 to:

    M671 X-30:260 Y115:115 S2
    

    It may make a small difference.

    Your probing speed F300 (5mm/s) in M558 is pretty fast, and can lead to inaccuracy; try F120 (2mm/s). Though you do have A20 S0.005 set, so it should probe a number of times anyway.

    Ian



  • Thank you! setting Y115 worked. I still have issues with inconsistent Z leveling, different order of commands seems to give diffierent results.


  • Moderator

    What order are you using? Bare in mind that any change in the tilt of the gantry will change the distance to the bed as well.


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