Piezo, Varning G28 readings not consistent



  • Hi, I'm trying to execute precision piezo v2.85 on Cartesian with Titan Aero extruder, but I couldn't. after all the attempts, Piezo, "Warning G28 readings not consistency" it seems that piezo does not trigger at the same height. As a bed, I have Creatily glass. Have tried to adjust V2 on PCB Piezo but it runs the same fault. What can be done more to work properly. Thanks.

    ; Configuration file for Duet WiFi (firmware version 2.03)
    ; executed by the firmware on start-up
    ;
    ; generated by RepRapFirmware Configuration Tool v2.1.8 on Sat Mar 07 2020 00:00:28 GMT+0100 (centraleuropeisk normaltid)
    
    ; General preferences
    G90                                     ; send absolute coordinates...
    M83                                     ; ...but relative extruder moves
    M550 P"My 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 S0                              ; physical drive 2 goes backwards
    M569 P3 S0                              ; physical drive 3 goes backwards
    M584 X0 Y1 Z2 E3                        ; set drive mapping
    M350 X16 Y16 Z16 E16 I1                 ; configure microstepping with interpolation
    M92 X160.00 Y160.00 Z400 E448           ; 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 Z50.00 E250.00     ; set accelerations (mm/s^2)
    M906 X800 Y800 Z800 E800 I30            ; set motor currents (mA) and motor idle factor in per cent
    M84 S30                                 ; Set idle timeout
    
    ; Axis Limits
    M208 X-60 Y0 Z0 S1                       ; set axis minima
    M208 X240 Y240 Z220 S0                   ; set axis maxima
    M208 X-60:240 Y0:240 Z0:220              ; set axis minima and maxima
    
    ; Endstops
    M574 X1 Y1 Z1 S1                        ; set active low and disabled endstops
    
    ; Z-Probe
    M558 P8 I1 R0.4 F420
    G31 X0 Y0 Z0.163 P100                    ; disable Z probe but set dive height, probe speed and travel speed
    M557 X15:240 Y15:240 S20                ; define mesh grid
                                       
    ; Heaters
    M305 P0 T100000 B4138 R4700             ; set thermistor + ADC parameters for heater 0
    M143 H0 S120                            ; set temperature limit for heater 0 to 120C
    M305 P1 T100000 B4138 R4700             ; set thermistor + ADC parameters for heater 1
    M143 H1 S280                            ; set temperature limit for heater 1 to 280C
    
    ; Fans
    M106 P0 S0 I0 F500 H-1                  ; set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
    M106 P1 S1 I0 F500 H1 T45               ; set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on
    
    ; Tools
    M563 P0 D0 S"TitanAero" 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
    
    
    
    ; homeall.g
    ; called to home all axes
    ;
    ; generated by RepRapFirmware Configuration Tool v2.1.8 on Sat Mar 07 2020 00:00:28 GMT+0100 (centraleuropeisk normaltid)
    G91                     ; relative positioning
    G1 H2 Z5 F6000          ; lift Z relative to current position
    G1 H1 X-245 Y-245 F1800 ; move quickly to X and Y axis endstops and stop there (first pass)
    G1 H2 X5 Y5 F6000       ; go back a few mm
    G1 H1 X-245 Y-245 F360  ; move slowly to X and Y axis endstops once more (second pass)
    G1 H1 Z-245 F200         ; move Z down stopping at the endstop
    G90                     ; absolute positioning
    G92 Z0                  ; set Z position to axis minimum (you may want to adjust this)
    G30                     ; lower head, stop when probe triggered and set Z to trigger height
    ; Uncomment the following lines to lift Z after probing
    ;G91                    ; relative positioning
    ;G1 Z5 F100             ; lift Z relative to current position
    ;G90                    ; absolute positioning
    ;G30                     ; lower head, stop when probe triggered and set Z to trigger height
    
    
    
    ; homeall.g
    ; called to home all axes
    ;
    ; generated by RepRapFirmware Configuration Tool v2.1.8 on Sat Mar 07 2020 00:00:28 GMT+0100 (centraleuropeisk normaltid)
    G91                     ; relative positioning
    G1 H2 Z5 F6000          ; lift Z relative to current position
    G1 H1 X-245 Y-245 F1800 ; move quickly to X and Y axis endstops and stop there (first pass)
    G1 H2 X5 Y5 F6000       ; go back a few mm
    G1 H1 X-245 Y-245 F360  ; move slowly to X and Y axis endstops once more (second pass)
    G1 H1 Z-245 F200         ; move Z down stopping at the endstop
    G90                     ; absolute positioning
    G92 Z0                  ; set Z position to axis minimum (you may want to adjust this)
    G30                     ; lower head, stop when probe triggered and set Z to trigger height
    ; Uncomment the following lines to lift Z after probing
    ;G91                    ; relative positioning
    ;G1 Z5 F100             ; lift Z relative to current position
    ;G90                    ; absolute positioning
    ;G30                     ; lower head, stop when probe triggered and set Z totrigger height
    
    
    ; homez.g
    ; called to home the Z axis
    ;
    ; generated by RepRapFirmware Configuration Tool v2.1.8 on Sat Mar 07 2020 00:00:29 GMT+0100 (centraleuropeisk normaltid)
    G91               ; relative positioning
    G1 H2 Z5 F600    ; lift Z relative to current position
    G1 H1 Z-245 F80   ; move Z down until the endstop is triggered
    G1 H2 Z1 F60      ; go back a few mm
    G1 H1 Z-245 F20   ; move slowly to X axis endstop once more (second pass)     
    G92 Z0            ; set Z position to axis minimum (you may want to adjust this)
    G30               ; lower head, stop when probe triggered and set Z to trigger height
    ; Uncomment the following lines to lift Z after probing
    ;G91              ; relative positioning
    ;G1 Z5 F100       ; lift Z relative to current position
    ;G90              ; absolute positioning
    
    

  • Moderator

    @chris4 said in Piezo, Varning G28 readings not consistent:

    M558 P8 I1 R0.4 F420

    You can try adding some parameters to increase the accuracy.

    M558 P8 I1 R0.4 F420 T6000 A10 S0.01

    This will cause it to probe at least twice and will reprobe up to 10 times until 2 consecutive probe results are within 0.01mm

    As for tuning the piezo sensor itself, try searching the forum for some tips on what others have used.


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