Magnetic Filament sensor issue



  • I bought a new sensor and immediately it kept failing saying zero movement or just random low numbers during a print every 30 seconds, I contacted duet3d who had me mail it to them in England to update the firmware etc and shipped it back. So I was without a sensor for a month.

    SO I received sensor back today and I hooked it up to my printer and it keeps stopping saying detected filament out? I immediately hit M591 D0 and get the measurement

    M591 D0
    Duet3D rotating magnet filament monitor v3 on input 3, enabled, sensitivity 23.77mm/rev, allow 70% to 130%, check every 3.0mm, current pos 112.1, measured sensitivity 271.77mm/rev, min 100% max 100% over 12.7mm

    30 seconds later again
    Duet3D rotating magnet filament monitor v3 on input 3, enabled, sensitivity 23.77mm/rev, allow 70% to 130%, check every 3.0mm, current pos 127.3, measured sensitivity 593.55mm/rev, min 100% max 100% over 12.8mm

    It appears the measured sensitivity reading is all over the place while its printing? Im printing with a solid red PETG at moment if that tells you anything? The print is printing fine so far I just have to keep hitting resume every 30 seconds.

    I emailed them back and this time they tell me sorry I cant give any technical advice post your question on the forum. GRRHH

    Im about fed up with trying to use their sensor and just go back to a simple microswitch which is actually reliable





  • I picked up a magnetic filament sensor about a month or two ago, and while I haven't completely nailed down my problems with it I keep getting negative min %), I did find that my duet board firmware was causing a lot of problems. Up to that point, I was running whatever firmware came with the board and I hadn't had any other problems. I updated to 2.04 and my magnetic sensor started working. Can I ask which firmware you are running? It should be available on your Machine specific tab, and the current release is 2.05. If I recall correctly you need to be running at least version 2.03 for the sensor to work properly. I was still on ~1.9, it connected but was a nightmare.



  • Firmware Version: 2.03 (2019-06-13b2)
    WiFi Server Version: 1.23
    Web Interface Version: 1.22.6

    Yes I'm on 2.03 firmware.



  • I'm glad you are running the right firmware, I'll keep watching this topic to see if anyone else can help you with it. I understand your frustration with having to hit resume every 30 seconds. At the moment I have my magnetic filament sensor set to S0 so it can monitor filament, but it disables the sensor from pausing the print. So it kind of seems pointless to even be running the thing. I need to spend more time figuring it out some time. I hope someone here will be able to help you, they have always been helpful when I have come here with questions.



  • M591 D0 P3 C3 S1 R30:130 L23.77 E3.0

    Here is my code, as you can see I have lowered the min drastically to try and counteract it stopping but to no avail. At this point I'm just of the mind that if it takes a lot of tweaking and and it's gonna be unreliable it's just not worth the hassle for a stupid filament sensor when a cheap $1 micro switch will do everything fine and reliably.

    I only bought it because I enjoy using high end products and getting the information from it etc....I use nothing but Duet boards on all my printers they are great but this is getting ridiculous


  • administrators

    @57buick, please upgrade to version 2.05 firmware. I added some extra diagnostic information for magnetic filament monitors at version 2.04.



  • ok once my 2 day print finishes Ill update the firmware again



  • where is the firmware? i googled it and it takes me to github but I dont see the file to download?


  • administrators

    In github for RepRapFirmware look for the Releases page.



  • I was trying to figure out my sensors quirks a bit more today, and I updated from 2.04 to 2.05 ( firmware is here: https://github.com/dc42/RepRapFirmware/releases/tag/2.05). I was still having a problem with negative values being reported for the min range on M561 D0, so I reviewed the set up page again. I saw a new argument that I am going to test, but it might help you too.

    "An (firmware 2.03 and later) 1 = check All extruder motion, 0 = only check extruder motion of printing moves (moves with both movement and forward extrusion)"

    I'm hoping that this will keep my min range more reasonable, and I thought it might be useful for you too.



  • @Grudairian said in Magnetic Filament sensor issue:

    I was trying to figure out my sensors quirks a bit more today, and I updated from 2.04 to 2.05 ( firmware is here: https://github.com/dc42/RepRapFirmware/releases/tag/2.05). I was still having a problem with negative values being reported for the min range on M561 D0, so I reviewed the set up page again. I saw a new argument that I am going to test, but it might help you too.

    "An (firmware 2.03 and later) 1 = check All extruder motion, 0 = only check extruder motion of printing moves (moves with both movement and forward extrusion)"

    I'm hoping that this will keep my min range more reasonable, and I thought it might be useful for you too.

    Thanks, that looks promising, I'll try that



  • Woah I just upgrade to 2.05 and now the web page looks totally different? and everything is larger and more confusing to find? is that normal?


  • Moderator

    @57buick That would be the new DWC 2.0. You can revert to the old version from the settings page. It takes some getting used to and it's still a work in progress. I say give it a chance and if you still don't like it you can swap back tot he old version.



  • I dont like it all, things are not organized in any way, I just converted back


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