Odd homing behaviour



  • Evening all I recently swapped out the bltouch sensor for an aus3d ir sensor I'm getting some random homing heights.
    I have it wired into the z probe connector on the duet wifi 2 board with the connector viewed at the bottom from left to right yellow black green and finally red.
    Is there likely to be anything residual in the settings ?
    I'm using a cctree (textured blue surface) wondered if this could be causing an issue!
    Just wondered if i had covered all my bases before suspecting the sensor at fault have attached my config is there anything I should enter g code wise prior to executing the G28 command within simplify to home all .
    It looks as if its doubling my z height as it looks to start printing where it should be starting from lol

    ; Configuration file for Duet WiFi (firmware version 2.03)
    ; executed by the firmware on start-up
    ;
    ; generated by RepRapFirmware Configuration Tool v2.1.2 on Tue Nov 12 2019 21:26:56 GMT+0000 (GMT)

    ; General preferences
    G90 ; send absolute coordinates...
    M83 ; ...but relative extruder moves
    M550 P"COREXY" ; set printer name

    M669 K1 ; select CoreXY mode

    ; 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 S1 ; physical drive 3 goes forwards
    M584 X0 Y1 Z2 E3 ; set drive mapping
    M350 X16 Y16 Z16 E16 I1 ; configure microstepping with interpolation
    M92 X80.00 Y80.00 Z1600.00 E420.00 ; set steps per mm
    M566 X600.00 Y600.00 Z120.00 E300.00 ; set maximum instantaneous speed changes (mm/min)
    M203 X6000.00 Y6000.00 Z600.00 E1200.00 ; set maximum speeds (mm/min)
    M201 X1200.00 Y1200.00 Z500.00 E1000.00 ; set accelerations (mm/s^2)
    M906 X800 Y800 Z2000 E800 I30 ; set motor currents (mA) and motor idle factor in per cent
    M84 S30 ; Set idle timeout

    ; Axis Limits
    M208 X-220 Y-220 Z0 S1 ; set axis minima
    M208 X220 Y220 Z660 S0 ; set axis maxima

    ; Endstops
    M574 X1 Y1 S0 ; set active low endstops
    M574 Z1 S2 ; set endstops controlled by probe

    ; Z-Probe
    M558 P1 H3 F150 T6000 A5 S0.015 ; set Z probe type to modulated and the dive height + speeds
    G31 P25 X2 Y32 Z4.55 ; set Z probe trigger value, offset and trigger height
    M557 X-205:215 Y-205:195 S20 ; define mesh grid

    ; Heaters
    M140 H-1 ; disable heated bed
    M305 P1 T100000 B4725 C7.060000E-8 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 T30 ; set fan 1 value, PWM signal inversion and frequency. 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

    ; homeall.g
    ; called to home all axes
    ;
    ; generated by RepRapFirmware Configuration Tool v2.1.2 on Tue Nov 12 2019 21:26:56 GMT+0000 (GMT)

    G91 ; relative positioning
    G1 Z15 F6000 S2 ; lift Z relative to current position
    G1 S1 Y-445 F1800 ; move quickly to Y axis endstop and stop there (first pass)
    G1 Y5 F6000 ; go back a few mm
    G1 S1 Y-445 F360 ; move slowly to Y axis endstop once more (second pass)
    G1 S1 X-445 F1800 ; move quickly to X axis endstop and stop there (first pass)
    G1 X5 F6000 ; go back a few mm
    G1 S1 X-445 F360 ; move slowly to X axis endstop once more (second pass)
    G90 ; absolute positioning
    G1 X0 Y0 F6000 ; go to first bed probe point and home Z
    G30 ; home Z by probing the bed

    ; Uncomment the following lines to lift Z after probing
    ;G91 ; relative positioning
    ;G1 S2 Z5 F100 ; lift Z relative to current position
    ;G90 ; absolute positioning





  • Thank you for the info what will this do for me in regards to the random z height ?

    Paste into "send G code" and let it do its thing

    M291 P"Probe will be tested 10 times and return mean and standard deviation. Ok or Cancel?" R"WARNING" S3 ; User must click OK or cancel.
    G28
    G30 P0 Z-9999
    G30 P1 Z-9999
    G30 P2 Z-9999
    G30 P3 Z-9999
    G30 P4 Z-9999
    G30 P5 Z-9999
    G30 P6 Z-9999
    G30 P7 Z-9999
    G30 P8 Z-9999
    G30 P9 Z-9999 S-1



  • it will tell you how consistent your probe is over an average of 10 reads



  • Hi finally got around to trying this and although it repeats itself consistently I still don't have the correct offset when I home the printer.
    I have tried placing different surfaces underneath the sensor thinking it can't see the printed clearly but when it homes it literally doubles the gap it should be once homed.



  • I have changed P1 to P2 for modulated and removed the H3 which is a heater setting remaining from previous BLTouch does it need to stay for the ir sensor?



  • if it consistent on the macro but the offset is wrong then you need to adjust the offset.


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