BL-touch related question



  • Hello,

    I am having difficulties finding the answer for why my sensor is not deploy or retract at all. I did the connections accordingly to the instructions, I bought non-original since I was not able to as it was not being shipped to country I live in. Anyway, I also tried the I1 method, P5, changing the heater to 7 checking the cables with the multimeter, the last thing I did not tried is 240ohm resistor between zmin and g. Config, deploy, retract files are as follows;

    FIRMWARE_NAME: RepRapFirmware for Duet 2 WiFi/Ethernet FIRMWARE_VERSION: 2.05.1 ELECTRONICS: Duet WiFi 1.02 or later FIRMWARE_DATE: 2020-02-09b1

    config.g.txt deployprobe.g.txt retractprobe.g.txt homeall.g.txt homez.g.txt bed.g.txt


  • Moderator

    What clone probe is it?

    What are you currently wired to?

    Does the probe turn on and self test when powered up?

    Your deploy and retract servo commands will require the inversion flag: I1

    M280 P3 S90 I1

    The config.g looks ok provided you're using heater pin 3.

    Do you have a config-override.g? If so, check it for a M307 H3 command that would be over writing your unbinding in config.g.



  • Thanks for quick reply, actually I got most of it from your posts, its 3d touch, not sure but bought around 2019 for an old ender 3, now running a corexy. Even if I give from m280 p3 S90 or S120 or S110 or S160 with or without I1 from the console it does not do anything. At the begining it does 2 drop and pull thought, red and blue lights are there. I deleted from the config override the Heater 3 value as well.


  • Moderator

    Sounds like wiring then. Check your crimps. You might need the resistor. It's hard to tell with clones but if it came with the resistor it's worth a shot. It shouldn't be an issue with the duet



  • Does extending the cable has an effect on it ?


  • Moderator

    Only if the connection is not good



  • I was able to make it work, there was a connection issue with the copper roundup on the top. The cable was ripped, I soldered and its working, Can someone direct me to somewhere where I can read about the mesh grid locations and why my X and Y endstops are not working anymore πŸ˜•


  • Moderator

    https://duet3d.dozuki.com/Wiki/Using_mesh_bed_compensation

    ?You'll need to provide more details about the endstops.



  • BLt can be very, very, very touchy about that connection.

    I was just rebuilding a printer that has a BLt. No changes to cabling. Took the wiring harness off one frame, put it on another. Power up. Fast blink. Take the wiring harness off. DVM continuity check it. All fine. Put it back on. Still red fast blink. Start plugging and unplugging connectors. About the 10th time on the 3-wire, AHA, two retract cycles, happy BLt.

    Unplug re-plug. Fast blink. Shi...ooot.

    Messed with that connector for a good 10 min. Never did figure out anything loose, or pull that way vs this way, or whatever. Finally took one of the times it initted properly and just wire-tied it all down. Sheesh.

    It has worked fine all day...


  • Moderator

    @Danal I think it may be the tiny connector on the BLTouch end. I don't think it takes much to damage it.



  • @Phaedrux said in BL-touch related question:

    @Danal I think it may be the tiny connector on the BLTouch end. I don't think it takes much to damage it.

    I suspect that as well. I pushed on it a bit... no conclusions as to which connector or what was wrong.



  • Well nice one for sure,
    In my condition, I just take the damn thing off, and solder it πŸ˜„ old guy habits, if it moves too much, put another screw on it πŸ˜›
    I managed to work it out, somehow my duet is not saving the config I am writing to config.bak and rest, so it was staying on air. I copied config to all, then did the mesh grid stuff. I am good, its working πŸ™‚ at last, but I am saying duet and bl touch, not a good deal.
    Now I have to work out to improve the prints cuz somehow I am getting partial less extrusion in some spots, empty areas with first layer and the outer rim. πŸ˜„ anyway good luck and I can help if anyone needs help they can text me πŸ˜„



  • @Leth-e said in BL-touch related question:

    somehow my duet is not saving the config I am writing to config.bak

    You should be editing the config.g, not the config.bak

    As for improving the prints, your nozzle my be too close to the bed and possibly you have not enabled β€˜use mesh grid’.

    HTH. Paul



  • If you use the web interface "system" tab, and right click to edit "config.g", it does all the .bak copying for you.

    Be aware that copy is "one deep". The .bak has saved me a few times, when the upload of the edited file failed right as it was being written, resulting in no config.g at all.

    Anyway, editing via that tab is the easiest way.



  • That is the place I use, usually I get 2 message, first says config.g saved, second says error to save config.bak / I also only edit config.g πŸ™‚



  • Even I changed my wifi on the card to ESP-07S to have external antenna still having connection issues, rather than the ones that advised in duet page, do you guys have any suggestions to make the connection a bit more not 'trying to reconnect' πŸ˜„



  • @Leth-e said in BL-touch related question:

    Even I changed my wifi on the card to ESP-07S to have external antenna still having connection issues, rather than the ones that advised in duet page, do you guys have any suggestions to make the connection a bit more not 'trying to reconnect' πŸ˜„

    Standard WiFi stuff. Get it closer to the router, make sure it is not blocked (in or near the printer) by metal, etc, etc.

    If absolutely nothing works, consider a WiFi extender near your printers. Preferably one with a hardwire back to your main router.



  • TP-LINK RE200 good choice ?



  • @Leth-e said in BL-touch related question:

    TP-LINK RE200

    Looks OK. I don't have hands on with that one; I do use a prior model that seems very similar, probably a direct predecessor, as an extender in one of my outbuildings. Works quite well.


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