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    How does this M591 status make any sense?

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    • gnydickundefined
      gnydick
      last edited by

      Pulse-type filament monitor on pin e0stop, enabled, sensitivity 0.800mm/pulse, allowed movement 50% to 150%, check every 50.0mm, measured sensitivity 0.423mm/pulse, measured minimum 166%, maximum 211% over 102.7mm
      

      How is .423mm/pulse at least 166% more than .800mm/pulse?

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      • dc42undefined
        dc42 administrators
        last edited by dc42

        It's the other way round. You are getting at least 166% of the expected number of pulses, because you have set it for one pulse every 0.8mm but you are getting one pulse per 0.423mm on average.

        Duet WiFi hardware designer and firmware engineer
        Please do not ask me for Duet support via PM or email, use the forum
        http://www.escher3d.com, https://miscsolutions.wordpress.com

        gnydickundefined 1 Reply Last reply Reply Quote 0
        • gnydickundefined
          gnydick @dc42
          last edited by

          @dc42 That's totally counterintuitive. "Too much movement", or to paraphrase "too many pulses" isn't the right way to express it.

          "Too much|little extrusion" makes more sense.

          The configuration is "mm/pulse". So "too much" anything is "too many mm/pulse." Not "too many pulse/mm" as your error message communicates.

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          • dc42undefined
            dc42 administrators
            last edited by dc42

            The message reports "measured sensitivity". More pulses/mm is obviously (IMO) greater sensitivity.

            I guess what's confusing you is that "measured minimum" is minimum measured vs. actual extrusion, which is not the same as sensitivity.

            Maybe I should change the configuration to pulses/mm instead of the other way round. This would probably make sense for sensors with >> 1 pulse/mm, but not for sensors with <1 pulse/mm.

            Duet WiFi hardware designer and firmware engineer
            Please do not ask me for Duet support via PM or email, use the forum
            http://www.escher3d.com, https://miscsolutions.wordpress.com

            gnydickundefined 1 Reply Last reply Reply Quote 0
            • gnydickundefined
              gnydick @dc42
              last edited by

              @dc42 yeah, definitely is more sensitivity. Either way, my suggestion is so long as the units are consistent between messaging and configuration, I think it'll be more intuitive.

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