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    False filament triggers on simple switch 3.1.1

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    Filament Monitor
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    • Joelundefined
      Joel
      last edited by Phaedrux

      Hi,

      I recently updated my Duet 2 WiFi to 3.1.1. Everything is working fine.

      Today I was doing a print and twice during the print, it stopped with a filament out message. All I did was hit resume to get it going again, filament was never out.

      It's TronXY X5SA Pro. The filament sensor is the kind where the filament just closes a micro switch. Not much to go wrong.

      Any thoughts?

      Thanks
      Joel

      config.g

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      • Phaedruxundefined
        Phaedrux Moderator
        last edited by

        Is something in the housing loose?
        Is the switch reliable?
        Is the wiring running next to other wires that could cause interference?

        Do you have your RRF2 config.g to compare against?

        https://duet3d.dozuki.com/Wiki/Gcode#Section_M591_Configure_filament_sensing

        I think your config looks correct for RRF3

        ; Filament sensor
        M591 D0 P2 C"e0stop" S1 ; Filament runout Sensor for Extruder E0 on E1 Endstop input P1 = signal HIGH.

        Z-Bot CoreXY Build | Thingiverse Profile

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        • jens55undefined
          jens55
          last edited by

          I don't have experience with the Tron but I have experience these kind of errors because the microswitch isn't adjuster right. I needed to bend the lever arm a bit to make the switch trigger a bit earlier. The filament was just a tad too far from the switch and sometimes it would think there wasn't filament even though there was.
          Anyway, just a thought ....

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          • Joelundefined
            Joel
            last edited by

            What I have is an ultra cheap switch. Does not look like anything is adjustable ( other than a bend here or there ). I don't think the switch setup is wrong, I would expect the config is right or not right. The switch works, just flaky. I don't think the wiring is exposed to any noise that could cause a problem. Filament always seems to jam up inside the box trying to get it to feed through. I will suspect that the switch is acting up.

            Any good not mechanical switches, I've seen some IR ones, do they work with transparent filament?

            Thanks
            Joel

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            • jens55undefined
              jens55
              last edited by

              What I was suggesting falls under 'a bend here or there'. While a flaky switch is certainly possible, I would try 'adjusting' it .... it worked for me and doesn't cost anything to try.

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              • Phaedruxundefined
                Phaedrux Moderator
                last edited by

                When I briefly used a simple mechanical micro switch with a level arm for a runout sensor I found that even when the path was very constrained the level arm would eventually lose contact with the filament enough to release the switch. If I changed the enclosure to be tighter the amount of friction was too much and it would eventually jam. In the end I changed to a switch with a wheel on the lever arm to allow it to roll. This worked better, but I eventually abandoned it as well.

                6bedf143-5443-408b-b646-6c38401eed1e-image.png

                Z-Bot CoreXY Build | Thingiverse Profile

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                • jens55undefined
                  jens55 @Phaedrux
                  last edited by

                  @Phaedrux said in False filament triggers on simple switch 3.1.1:
                  This worked better, but I eventually abandoned it as well.

                  6bedf143-5443-408b-b646-6c38401eed1e-image.png

                  What did you go with ?

                  Phaedruxundefined 1 Reply Last reply Reply Quote 0
                  • Phaedruxundefined
                    Phaedrux Moderator @jens55
                    last edited by Phaedrux

                    @jens55 said in False filament triggers on simple switch 3.1.1:

                    What did you go with ?

                    I weigh the spool before I start the print.

                    Z-Bot CoreXY Build | Thingiverse Profile

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                    • jens55undefined
                      jens55
                      last edited by

                      What if your print takes more than a single spool ?

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                      • Phaedruxundefined
                        Phaedrux Moderator
                        last edited by

                        Well if it takes more than my current print I choose a spool that has enough. If the printed needed more than a full 1kg of plastic I'm not sure what I'd do. It's never come up.

                        Z-Bot CoreXY Build | Thingiverse Profile

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                        • jens55undefined
                          jens55
                          last edited by

                          It's surprising how quickly you can go through a 1 kg spool when printing with a 0.8 mm nozzle and a Volcano heat block. When I print large objects, I print LARGE objects 🙂
                          Anyway, I have not had an issue with a simple microswitch without a roller.

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                          • Phaedruxundefined
                            Phaedrux Moderator
                            last edited by

                            I do have a Duet laser sensor and was thinking of maybe doing one of these two mods

                            https://forum.duet3d.com/topic/10042/indirect-bearing-laser-filament-monitor-concept

                            https://forum.duet3d.com/topic/15799/laser-filamant-sensor-with-switch-housing

                            Z-Bot CoreXY Build | Thingiverse Profile

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                            • Joelundefined
                              Joel
                              last edited by

                              This post is deleted!
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