BLtouch - strange behavior



  • Good morning all:

    I have been using an EZabl for a while and had very weird consistency issues with it. So i've switched to a genuine BLtouch and have had great results!

    The only problem I've had is every so often, the probe starts flashing. The only way I've been able to resolve it is to restart the printer a number of times.

    I can clear the flashing with a macro:
    M280 P64 S160 ; Alarm Release and Push-Pin UP

    But then when I try to deploy the pin again (M280 P64 S10 ) it just starts flashing again.

    I'm really out of ideas. Any thoughts?

    Its a Maestro board and here is my config.g:
    ; Configuration file for Duet WiFi (firmware version 1.21)
    ; executed by the firmware on start-up
    ;
    ; generated by RepRapFirmware Configuration Tool v2 on Mon Mar 11 2019 13:47:47 GMT-0500 (Central Daylight Time)

    ; General preferences
    G90 ; Send absolute coordinates...
    M83 ; ...but relative extruder moves

    ; Network
    M550 P"Ender 3" ; Set machine name
    M552 S1 ; Enable network
    M586 P0 S1 ; Enable HTTP
    M586 P1 S0 ; Disable FTP
    M586 P2 S0 ; Disable Telnet
    M552 P192.168.1.14
    M554 P192.168.1.1
    M553 255.255.255.0

    ; Drives
    M569 P0 S0 ; Drive 0 goes backwards
    M569 P1 S0 ; Drive 1 goes backwards
    M569 P2 S1 ; Drive 2 goes forwards
    M569 P3 S1 ; Drive 3 goes forwards
    M350 X16 Y16 Z16 E16 I1 ; Configure microstepping with interpolation
    M92 X80.00 Y80.00 Z400.00 E393.00 ; Set steps per mm
    M566 X1200.00 Y1200.00 Z24.00 E120.00 ; Set maximum instantaneous speed changes (mm/min)
    M203 X30000.00 Y30000.00 Z300.00 E1500.00 ; Set maximum speeds (mm/min)
    M201 X500.00 Y500.00 Z100.00 E5000.00 ; Set accelerations (mm/s^2)
    M906 X600.00 Y600.00 Z600.00 E700.00 I30 ; Set motor currents (mA) and motor idle factor in per cent
    M84 S30 ; Set idle timeout
    M572 D0 S0.05 ; Pressure Advance

    ; Axis Limits
    M208 X-5.5 Y-10 Z0 S1 ; Set axis minima
    M208 X258.5 Y246 Z260 S0 ; Set axis maxima

    ; Endstops
    M574 X1 Y1 S1 ; Set endstops

    ; Z-Probe
    M574 Z1 S2 ; Set endstops controlled by probe
    ; M558 I1 P5 H5 F120 T6000 ; EZABL Set Z probe type to unmodulated and the dive height + speeds
    M558 P9 F100 H5 R0.2 T6000 ; new BL
    ; G31 P100 X0 Y20 Z3.2 ; Set Z probe trigger value, offset and trigger height
    ; G31 P100 X41 Y0 Z1.7 ; EZABL Offset
    G31 P100 X36 Y0 Z3.150 ; BLTOUCH
    M557 X35:215 Y25:215 S40 ; Define mesh grid M557 X20:215 Y20:215 S65

    ; Heaters
    M305 P0 T100000 B4138 R2200 ; Set thermistor + ADC parameters for heater 0
    M143 H0 S120 ; Set temperature limit for heater 0 to 120C
    M305 P1 T100000 B4138 R2200 ; Set thermistor + ADC parameters for heater 1
    M143 H1 S280 ; Set temperature limit for heater 1 to 280C

    ; Fans
    M106 P0 S0.3 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 H1 ; 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

    ; Automatic power saving
    M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; Set voltage thresholds and actions to run on power loss

    ; Custom settings are not configured



  • It sounds like your pin may be damaged or dirty. You can take it out of the housing to check it and clean it with the grub screw at the top of the probe.


  • administrators

    The flashing means that the BLTouch is in an error state. There is a M280 command you can send to reset it, but I don't have the details right now.



  • the bltouch goes into error state if it cant deploy or retract.
    most of the time it can be fixed by adjusting the grub screw at the top.

    sometimes you have to fix the heatshrink on the pin.



  • Thanks guys. I took it apart and Everything looked ok. I did clean it off and reassembled it. Let’s see if that helps.

    Thanks again for the responses. This one had me stumped.


 

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