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    Laser Filament Monitor - test results

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    Filament Monitor
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    • fmaundefined
      fma
      last edited by

      Yes, that's why I suggested to use something transparent, but reacting to IR...

      Frédéric

      brunofportoundefined 1 Reply Last reply Reply Quote 0
      • brunofportoundefined
        brunofporto @fma
        last edited by

        @fma Well.... That should work but then there is the issue of finding a paint or marker that does not add color, mess with filament properties or is chemically innert to most of them, is opaque to IR and worldwide available 😄

        One alternative to that would be use the old hob wheel against a bearing and then read the bearing surface as this sensor is very good at reading stainless steel. Nut we would be back to the limitations, higher cost and issues of a hardware dependent filament monitor.

        Another thing would be use some optics focus the sample filament length to the full sensor area available... But: expensive... complicated... can scratch and get dirty..etc....

        I believe that with enough real world data and a good sample area they can tune it and suggest good margins.

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

          So, I've tested printing a sensor housing, and then painting it in black 2.0 paint. An IR cam & IR light shows the black 2.0 is very IR absorbant. However, I've seen zero difference between the painted housing and the Carbon Fiber PETG housing I started with. (Which also seems to absorb IR very well on camera at least).

          I keep forgetting to record the results after prints.

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

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

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          • fmaundefined
            fma @brunofporto
            last edited by

            @brunofporto said in Laser Filament Monitor - test results:

            @fma Well.... That should work but then there is the issue of finding a paint or marker that does not add color, mess with filament properties or is chemically innert to most of them, is opaque to IR and worldwide available 😄

            I would like to make some tests, with different stuff. My idea is to use some sort of gear to put something at regular steps. What length of filament does sensor see? Just to design the gear pitch...

            Frédéric

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

              @fma said in Laser Filament Monitor - test results:

              I would like to make some tests, with different stuff. My idea is to use some sort of gear to put something at regular steps. What length of filament does sensor see? Just to design the gear pitch...

              My guess is not very much, because the laser spot should be small. Unfortunately the data sheet doesn't specify the beam divergence. It does say that the distance between the sensor and the target should be at least 3mm to get maximum resolution.

              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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              • fmaundefined
                fma
                last edited by

                Ok, thanks. I'll try to make a small pitch...

                Frédéric

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                • Snypesundefined
                  Snypes
                  last edited by

                  This post is deleted!
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                  • Snypesundefined
                    Snypes
                    last edited by

                    Has anyone considered uncoupling the filament from the laser and having the laser read a constant metallic surface for example (much like an idler bearing maybe?)?

                    That's pretty much the solution used by jtx on his skelestruder and it would at least allow all filaments to be calibrated against a constant....

                    https://www.thingiverse.com/thing:3091625

                    T3P3Tonyundefined 1 Reply Last reply Reply Quote 0
                    • kraegarundefined
                      kraegar
                      last edited by

                      I may have a new "least accurate filament" - Atomic Marble PLA

                      Duet3D laser filament monitor on endstop input 3, disabled, allowed movement 40% to 120%, check every 3.0mm, current position -1.1, brightness 96, shutter 17, measured minimum 12%, average 71%, maximum 167% over 92403.1mm

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

                      T3P3Tonyundefined Alexander Mundyundefined 2 Replies Last reply Reply Quote 0
                      • brunofportoundefined
                        brunofporto
                        last edited by

                        I do also compare the slicer predicted filament usage with the measures filament usage and have a very unusual inverse relation where the ones with the worst reading % also have the most accurate measurement of total filament usage!

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

                          @kraegar wow. so opaque to visible light but possibly not to IR...? strangely bad!

                          www.duet3d.com

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                          • T3P3Tonyundefined
                            T3P3Tony administrators @Snypes
                            last edited by

                            @snypes well the magnetic monitor does that and if we add that complexity then it's easier to use the hall sensor than the laser

                            www.duet3d.com

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                            • brunofportoundefined
                              brunofporto
                              last edited by

                              How can I register the readings of the entire print instead of max, min and avg?

                              I would like to see the full information, alongside retract and extrusion commands.

                              then I will be able to really visualize skipping/clogging effects and separate them from the "normal flow" average and deviation to better tune the thresholds.

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

                                @brunofporto thats not a function in the firmware right now. the documentation:

                                https://duet3d.dozuki.com/Wiki/Duet3dFilamentMonitor_LaserVersion

                                explains the protocol used however it would need to be a firmware feature request to have some way of logging/outputting this information. When the filament is detected as moving there is a movement data packet sent ever 40ms, fair bit of information to handle.

                                www.duet3d.com

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                                • brunofportoundefined
                                  brunofporto @T3P3Tony
                                  last edited by brunofporto

                                  @t3p3tony

                                  Would hurt the duet's processor asks a lot of M591 and log with M929? I mean, it is possible to use these commands to register the readings over time?

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                                  • Alexander Mundyundefined
                                    Alexander Mundy @kraegar
                                    last edited by

                                    @kraegar Sorry to be off topic, but curious if you have you set non linear extrusion or pressure advance for the Atomic Marble? The PETG version is way different than other PETG's extrusion wise.

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                                    • kraegarundefined
                                      kraegar
                                      last edited by

                                      That was the PLA marble, and I left the pressure advance at the same setting as my other filaments. No other changes.

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

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                                      • T3P3Tonyundefined
                                        T3P3Tony administrators @wilriker
                                        last edited by

                                        @wilriker I have finally updated the design here:
                                        https://www.youmagine.com/designs/duet3d-laser-filament-monitor-housing-v2

                                        www.duet3d.com

                                        wilrikerundefined 1 Reply Last reply Reply Quote 0
                                        • wilrikerundefined
                                          wilriker @T3P3Tony
                                          last edited by

                                          @t3p3tony I had merged your changes manually into the original SCAD file by David. It did not improve the results in my tests. They were actually a little bit worse.

                                          But currently my printing is completely on hold and will be for another couple of weeks. After that I will compare your updated version with the one I had created.

                                          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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