Flickering led on Smart Effector probe



  • There is a flicker on the probe led after updating to firmware 3. This problem I did not have before. I can probe without any problem when the nozzle is cold, as soon as it reaches 190 celsius it starts to flicker and I cant probe(Error: Z probe already triggered at start of probing move). If I jog halfway up the towers (Delta Duet WiFi) the led goes off. I have changed all the cable to rule out the possibility of a bad connection.
    The code is from RRF Config Tool

    ; Z-Probe
    M558 P5 R0.4 C"zprobe.in+zprobe.mod" H5 F1200 T6000 ; set Z probe type to effector and the dive height + speeds
    G31 P500 X0 Y0 Z2.5 ; set Z probe trigger value, offset and trigger height
    M557 R85 S20 ; define mesh grid


  • administrators

    I am fairly sure that is caused by a bad connection, most likely a bad crimp connection in the +3.3V or ground wire to the 8-pin connector, but possibly a bad solder joint on the effector.



  • I had a similar problem, it was fluff on the cooling fan causing imbalance and vibration. Only present when thermostatic fan came on with higher nozzle temp.



  • Still no success. I changed the PCB but the problem persists. Then I noticed that if the heat bed was switched off then the probing went really well if the heat bed was sett to 0 degrees and up it was not possible to probe without getting P1000. The problem that remained was that when I was going to print, the nozzle went straight down into the heat bed and started printing at around -5mm and I had to use babystep to get up to 0. I had hoped the upgrade to the latest firmware 3.01 would solve the problem but did not. Now when I start the printer shows P1000 the led is not on. Any thoughts about what it might be?


  • administrators

    @Gunnars said in Flickering led on Smart Effector probe:

    Then I noticed that if the heat bed was switched off then the probing went really well

    It sounds like either your bed heater is generating very large magnetic fields, or you have a grounding problem or a PSU problem. What sort of bed heater is it?

    The problem that remained was that when I was going to print, the nozzle went straight down into the heat bed and started printing at around -5mm

    What do you have the trigger height set to in your G31 command? It should be about Z-0.1.


Log in to reply