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    Laser Filament Monitor - test results

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    Filament Monitor
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    • T3P3Tonyundefined
      T3P3Tony administrators @dc42
      last edited by

      @dc42 said in Laser Filament Monitor - test results:

      @t3p3tony said in Laser Filament Monitor - test results:

      @DC42 It would be great to have the ability to set the 100% amount in much the same manner as the mm/revolution of the magnet can be set in that version.

      I think it would be confusing to change the 100% amount. Also, if the sensor under-reads the average amount for a particular filament, you are also likely to get much bigger variation for that filament. For example, the post by @Qdeathstar gives 93% to 99% for one filament, and 45% to 89% for another. So simply adjusting the 100% amount wouldn't be sufficient.

      Instead I think you should use the new M703 command in conjunction with the filament management facility to set up appropriate R limits in the M591 command for the filament in use.

      Hi David, sure can set the limits to whatever, I was just thinking that it would be nice to "zero" the filament on the average for that type. Actually I might have zeroed it on the low reading as I don't care if it reads an "over extrusion" since the failure modes we are generally interested in lead to under, not over extrusion.

      www.duet3d.com

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      • wilrikerundefined
        wilriker
        last edited by

        😠 Something seems to not want me to use this sensor. Second attempt to print the housing failed also. This time my fan shroud was somehow coming loose (never ever had this before) and knocked the print of the bed. 🤦

        Manuel
        Duet 3 6HC (v0.6) with RPi 4B on a custom Cartesian
        with probably always latest firmware/DWC (incl. betas or self-compiled)
        My Tool Collection

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        • Qdeathstarundefined
          Qdeathstar
          last edited by

          Ok, last ABS test

          Matterhackers Light - Blue ABS filament - Benchy Test

          Calculated Steps/mm 424

          M591 D0
          Duet3D laser filament monitor on endstop input 3, disabled, allowed movement 40% to 120%, check every 3.0mm, current position -2.4, brightness 92, shutter 11, measured minimum 0%, average 93%, maximum 102% over 3975.4mm

          wilrikerundefined T3P3Tonyundefined 2 Replies Last reply Reply Quote 0
          • wilrikerundefined
            wilriker @Qdeathstar
            last edited by

            @qdeathstar You seem to like ABS. 😉

            Manuel
            Duet 3 6HC (v0.6) with RPi 4B on a custom Cartesian
            with probably always latest firmware/DWC (incl. betas or self-compiled)
            My Tool Collection

            1 Reply Last reply Reply Quote 0
            • T3P3Tonyundefined
              T3P3Tony administrators @Qdeathstar
              last edited by

              @qdeathstar said in Laser Filament Monitor - test results:

              Ok, last ABS test

              Matterhackers Light - Blue ABS filament - Benchy Test

              Calculated Steps/mm 424

              M591 D0
              Duet3D laser filament monitor on endstop input 3, disabled, allowed movement 40% to 120%, check every 3.0mm, current position -2.4, brightness 92, shutter 11, measured minimum 0%, average 93%, maximum 102% over 3975.4mm

              minimum 0?

              do you mind checking that again?

              www.duet3d.com

              Qdeathstarundefined 1 Reply Last reply Reply Quote 0
              • Qdeathstarundefined
                Qdeathstar
                last edited by

                Yes, i can rerun that test later today. I think that might have been a real slippage, as this blue filament feels pretty slippery. I also noticed while i was loading it it didn't move the first time i pressed "extrude" but i chalked it up to me accidentally pressing the "retract" button instead. Its about 2 years old....

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                • kraegarundefined
                  kraegar
                  last edited by

                  I like spreadsheets, so I created one for tracking my results. Any other data needed?

                  https://docs.google.com/spreadsheets/d/1a5suKtijUsatl3DhUFiox_rfW39qo9kHSlihYHaAcxo/edit?usp=sharing

                  Co-Creator of the RailcoreII CoreXY printer
                  https://www.thingiverse.com/thing:2407174

                  tinkerzundefined 1 Reply Last reply Reply Quote 0
                  • tinkerzundefined
                    tinkerz @kraegar
                    last edited by

                    @kraegar Thank you! Not sure why I didn't think of putting it up on Google docs, here I have all my results in good 'ol Notepad++. Thank you again. This makes it easy to keep updated without worrying about saving, losing or sharing.

                    Tinkerz

                    kraegarundefined 1 Reply Last reply Reply Quote 0
                    • kraegarundefined
                      kraegar @tinkerz
                      last edited by

                      @tinkerz No problem - I have a ridiculous number of data tracking spreadsheets for 3d printing. I can't do anything without tracking it, lol.

                      Co-Creator of the RailcoreII CoreXY printer
                      https://www.thingiverse.com/thing:2407174

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                      • Qdeathstarundefined
                        Qdeathstar @T3P3Tony
                        last edited by

                        @t3p3tony said in Laser Filament Monitor - test results:

                        @qdeathstar said in Laser Filament Monitor - test results:

                        Ok, last ABS test

                        Matterhackers Light - Blue ABS filament - Benchy Test

                        Calculated Steps/mm 424

                        M591 D0
                        Duet3D laser filament monitor on endstop input 3, disabled, allowed movement 40% to 120%, check every 3.0mm, current position -2.4, brightness 92, shutter 11, measured minimum 0%, average 93%, maximum 102% over 3975.4mm

                        minimum 0?

                        do you mind checking that again?

                        M591 D0
                        Duet3D laser filament monitor on endstop input 3, disabled, allowed movement 40% to 120%, check every 3.0mm, current position -3.0, brightness 91, shutter 11, measured minimum 88%, average 95%, maximum 102% over 3973.3mm

                        Better result this time.

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                        • wilrikerundefined
                          wilriker
                          last edited by

                          Finally managed to print the sensor housing. It seems that the lazy-me (why should I disassemble my X axis before lubricating it?) got some PTFE on my build plate - perfect for first-layer adhesion. 🤦 Luckily nothing that gluestick won't overcome. 😂

                          So, assembly and mounting of the sensor probably tonight. 🙂

                          Manuel
                          Duet 3 6HC (v0.6) with RPi 4B on a custom Cartesian
                          with probably always latest firmware/DWC (incl. betas or self-compiled)
                          My Tool Collection

                          1 Reply Last reply Reply Quote 0
                          • wilrikerundefined
                            wilriker
                            last edited by wilriker

                            Finally, the first result I can contribute:

                            Generic Black PLA (the same that is used for the housing):
                            Duet3D laser filament monitor on endstop input 3, disabled, allowed movement 40% to 120%, check every 3.0mm, current position -7.9, brightness 60, shutter 17, measured minimum 80%, average 87%, maximum 93% over 320.6mm

                            Housing: @dc42 original, Open Top, 9mm base
                            PTFE Tubing: Generic 4mm OD 2mm ID (I will probably switch to the included Capricorn when I first switch housing parts.

                            I am so happy to be part of the test group. As I don't have too many filaments I will probably mainly be concentrating on housing performance.


                            Also, this gave me a chance to solve a very annoying issue I introduced myself when I added my reverse bowden. It literally took me 15-20 minutes(!) to change filament because the extruder-near end of it was totally in the way and I ended up disassembling the extruder every other time.
                            The sensor housing now also is my reverse bowden endpoint and is mounted via nuts and screws so I can easily remove it when loading filaments. 🕺

                            EDIT: Also no started a Google Spreadsheet.

                            Manuel
                            Duet 3 6HC (v0.6) with RPi 4B on a custom Cartesian
                            with probably always latest firmware/DWC (incl. betas or self-compiled)
                            My Tool Collection

                            1 Reply Last reply Reply Quote 1
                            • fmaundefined
                              fma
                              last edited by fma

                              Ok, here is my first result. I use David's enclosure, printed in black PLA.

                              I printed a part with Dailyfil cream white: https://www.filimprimante3d.fr/filament-pla-175-mm/1470-bobine-pla-dailyfil-blanc-creme-175-mm-1kg.html

                              Duet3D laser filament monitor on endstop input 3, disabled, allowed movement 40% to 140%, check every 3.0mm, current position -10.2, brightness 94, shutter 8, measured minimum 53%, average 93%, maximum 107% over 5764.6mm

                              Frédéric

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                              • fmaundefined
                                fma
                                last edited by

                                Second test with SOVB3D purple PLA: http://www.sovb3d.fr/pla-175mm-standard-500g/90-fil-pla-violet-175mm-500g.html

                                Duet3D laser filament monitor on endstop input 3, disabled, allowed movement 40% to 140%, check every 3.0mm, current position 2.7, brightness 93, shutter 11, measured minimum 56%, average 84%, maximum 99% over 3425.2mm

                                Frédéric

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                                • dc42undefined
                                  dc42 administrators
                                  last edited by

                                  FWIW the shutter reading is an indication of how much of the laser light is returning back to the sensor, which should be mostly determined by how reflective the filament is. High shutter reading = low refectivity.

                                  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

                                  wilrikerundefined 1 Reply Last reply Reply Quote 0
                                  • wilrikerundefined
                                    wilriker @dc42
                                    last edited by

                                    @dc42 I wanted to ask about shutter anyway. What is the range of values and what qualifies as high/low value?
                                    And when we are at that, can you also say something about the brightness value?

                                    Manuel
                                    Duet 3 6HC (v0.6) with RPi 4B on a custom Cartesian
                                    with probably always latest firmware/DWC (incl. betas or self-compiled)
                                    My Tool Collection

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                                    • dc42undefined
                                      dc42 administrators
                                      last edited by

                                      The brightness is the average brightness of IR light received on the sensor. It doesn't usually vary as much as the shutter does, because the sensor appears to adjusts the shutter to try to keep the brightness constant.

                                      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

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                                      • kraegarundefined
                                        kraegar
                                        last edited by

                                        So to be clear, the ideal situation would be a totally enclosed housing that doesn't reflect any IR back?

                                        Co-Creator of the RailcoreII CoreXY printer
                                        https://www.thingiverse.com/thing:2407174

                                        dc42undefined 1 Reply Last reply Reply Quote 0
                                        • dc42undefined
                                          dc42 administrators @kraegar
                                          last edited by

                                          @kraegar said in Laser Filament Monitor - test results:

                                          So to be clear, the ideal situation would be a totally enclosed housing that doesn't reflect any IR back?

                                          Yes, I think so.

                                          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

                                          1 Reply Last reply Reply Quote 0
                                          • kraegarundefined
                                            kraegar
                                            last edited by

                                            What wavelength is the IR?

                                            Co-Creator of the RailcoreII CoreXY printer
                                            https://www.thingiverse.com/thing:2407174

                                            dc42undefined 1 Reply Last reply Reply Quote 0
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