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    Auto pressure advance turning by hotend pressure

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    • PenguinAkikoundefined
      PenguinAkiko @T3P3Tony
      last edited by

      @T3P3Tony found some articles https://airtripper.com/1338/airtripper-extruder-filament-force-sensor-introduction/

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      • PenguinAkikoundefined
        PenguinAkiko
        last edited by

        15 minutes, 16 seconds to 17 seconds, the hotend moves up and down.
        https://www.youtube.com/watch?v=EZ3BtQ7k9Ak

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        • nikschaundefined
          nikscha
          last edited by

          I love the idea!
          I guess you could write a gcode snippet in daemon.g which continously reads straingauge values and adjusts pressure advance values?
          Duet can read sensors via SPI, maybe a dedicated "strain gauge sensor" option would be possible? One could also put together a small PCB that amplifies the strain gauge reading into a voltage that can just be read by a linear analog sensor on the Duet?

          Stay in school

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          • PenguinAkikoundefined
            PenguinAkiko @nikscha
            last edited by

            @nikscha macro not fast enough, and this is my idea https://forum.duet3d.com/post/324006

            nikschaundefined 1 Reply Last reply Reply Quote 0
            • PenguinAkikoundefined
              PenguinAkiko
              last edited by

              Automated PA testing is still an early idea. I hope to implement z probe and collect enough PA pressure data for research.

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              • nikschaundefined
                nikscha @PenguinAkiko
                last edited by nikscha

                @penguinya I think it would be fast enough. Just put a "while true" into daemon.g and then a G4 P50 in the body to execute your script every 50ms. (Edit: this wouldn't actually run that frequent, more like 3-6 times a second)

                I don't think pressure advance needs to be adjusted that often, right?

                Stay in school

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                • PenguinAkikoundefined
                  PenguinAkiko @nikscha
                  last edited by PenguinAkiko

                  @nikscha Bambu Lab tests pa every print, and 50ms really slow, HX711 can reach 80HZ, Prusa using HX717 320HZ, higher the sampling frequency, the more beneficial for auto PA testing.

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                  • PenguinAkikoundefined
                    PenguinAkiko
                    last edited by

                    find a better chip for load cell.
                    CS1237 http://www.asidesigner.com/Files/PartFiles/15315/222/cs1237_datasheet.pdf
                    spi bus 1.28kHz ADC and PGA

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                    • PenguinAkikoundefined
                      PenguinAkiko @nikscha
                      last edited by

                      @nikscha Here is a post about sampling speed
                      https://forum.duet3d.com/post/251488

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                      • PenguinAkikoundefined
                        PenguinAkiko
                        last edited by

                        https://wiki.bambulab.com/en/a1/manual/intro-a1
                        6a24e275-8229-41b9-836e-b747de77409f-image.png

                        PenguinAkikoundefined 1 Reply Last reply Reply Quote 0
                        • PenguinAkikoundefined
                          PenguinAkiko @PenguinAkiko
                          last edited by

                          @penguinya The introduction of bambulab confirmed my guess.

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                          • Charlieundefined
                            Charlie
                            last edited by

                            Correct me if Im wrong, but I feel like this sensor could also be used for filament runout/jam detection as well. Like if the force expected by feeding the filament is not produced, it could indicate that there is some filament error.

                            PenguinAkikoundefined Richard Fundefined 2 Replies Last reply Reply Quote 0
                            • PenguinAkikoundefined
                              PenguinAkiko @Charlie
                              last edited by

                              @Charlie Yes prusa has implemented it

                              Charlieundefined MJLewundefined 2 Replies Last reply Reply Quote 0
                              • Richard Fundefined
                                Richard F @Charlie
                                last edited by

                                @Charlie would a mouse optical sensor work to monitor filament

                                do we need more than this for a run out trigger Untitled.png

                                oliofundefined Charlieundefined 2 Replies Last reply Reply Quote 0
                                • oliofundefined
                                  oliof @Richard F
                                  last edited by

                                  @Richard-F that's the simple runout switch that you find on many printers. There are other filament failures you'd want to catch.

                                  <>RatRig V-Minion Fly Super5Pro RRF<> V-Core 3.1 IDEX k*****r <> RatRig V-Minion SKR 2 Marlin<>

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                                  • Charlieundefined
                                    Charlie @PenguinAkiko
                                    last edited by

                                    @penguinya Do you have a link to this? I havent seen anything about it.

                                    PenguinAkikoundefined 1 Reply Last reply Reply Quote 1
                                    • Charlieundefined
                                      Charlie @Richard F
                                      last edited by

                                      @Richard-F It would absolutely work. Ive seen a few systems using this, and Ive used it myself in the past. I know the Duet supports it, though Id recommend looking around to see how others have implemented it. (eg: using printed levers to contact the filament instead of the switch lever contacting the filament directly)

                                      Richard Fundefined 1 Reply Last reply Reply Quote 1
                                      • Richard Fundefined
                                        Richard F @Charlie
                                        last edited by

                                        @Charlie Thanks 🙂

                                        Charlieundefined 1 Reply Last reply Reply Quote 0
                                        • Charlieundefined
                                          Charlie @Richard F
                                          last edited by

                                          @Richard-F Youre welcome. Happy Printing! 🙂

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                                          • PenguinAkikoundefined
                                            PenguinAkiko
                                            last edited by

                                            Just an updating.
                                            29e4d811-198b-4c9a-b74e-a4e8dd480b3d-image.png

                                            Charlieundefined 1 Reply Last reply Reply Quote 0
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