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Laser Filament Monitor - test results

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Filament Monitor
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  • undefined
    tinkerz @tinkerz
    last edited by 8 Sept 2018, 22:44

    @wilriker disregard, wrote a quick gcode file and figured it out, comes out on the WebUI. Perfect. Adding to end scripts. Now we just need logging. 😉

    Tinkerz

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      wilriker
      last edited by wilriker 16 Sept 2018, 17:59

      I switched housing again to the cone-shaped interior one on Thursday night and printed something on Friday. At the end of the print the statistics looked awfully low and I was already blaming the housing. When I inspected the prints, though, it turned out the sensor was right. I had massive under-extrusions especially on one layer because my filament spool had fallen off the rolling spool holder and the friction was too high for the extruder to pull where lots of filament where required quickly.

      So, now I decided to enable the sensor for the current filament though I am still testing. Let's see how often my prints will be paused. 😁

      P.S.: A third option for the sensor would be nice. Currently there is just

      1. ignore issues (but collect statistics) and
      2. pause the print on issue detected

      I would like to see a third option where issues would just send a warning but the print still continues.

      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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        KeeganB
        last edited by KeeganB 20 Sept 2018, 18:28

        Hi All!

        First, sorry it has taken me so long to join in on this thread! Life has been keeping me away from printing lately.

        I am testing the monitor on a SeeMeCNC Artemis. As such, I designed a mount for it that attaches it directly to the EZRstruder. Here are a few pictures of the mount. I have only done one print with it, and everything seemed to work fine. I will get a spreadsheet going with my results. I will also upload the mount STLs to Thingiverse and drop a link here.

        One thing that I realized after my first print, was that my mount doesn't have an enclosed side on the opposite side of the filament from the laser. On David's Thingy file it has a small extruded box there, but I didn't even think about that when modeling.

        alt text
        alt text
        alt text
        alt text

        Well, there are photos there I think. I can't figure out how to do them I guess?!

        Thingiverse Link: https://www.thingiverse.com/thing:3111798

        Artemis
        Rostock Max v2
        Orion

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          brunofporto @T3P3Tony
          last edited by 20 Sept 2018, 20:06

          @t3p3tony said in Laser Filament Monitor - test results:

          @guyaros That looks great. actually during test on the filament we used etc we got the best readings at 9mm gap but that is not conclusive. worth trying a variety of gaps.

          I'll print the first with 9mm then 😄

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            brunofporto
            last edited by brunofporto 24 Sept 2018, 14:20

            I am designing my casing. Please, what is the recommended aperture angle for the sensor window/channel?

            I remember reading it somewhere at this category but could not find it anymore.... Thanks!

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              brunofporto
              last edited by 27 Sept 2018, 12:58

              Here are my results so far.

              The first two prints where made with Blue and Dark Purple ABS. One of the things that made me extremely happy was that these first two prints where slightly under extruded (little gaps at top layers). And as the average readings where consistent I used them as reference to tune the steps/mm. Based on the average (93%) I increased the steps/mm of the extruder from 85 to 91,4 and the next print was flawless.... With average of 100% and perfect top layers (IMO).

              Then I started to test different materials and colors. The two translucent tests where with PETG and PLA. The curious thing is that besides the readings differ a lot from the reference blue ABS they ratio of predicted length to read length is better!!! While the ABS was between 94% and 98% the transparent generic PLA was better than 99%!

              @T3P3Tony and @dc42 I am compiling all my prints at https://docs.google.com/spreadsheets/d/14YdQkZd0Ojso2ye2EpN1kS2Y_nZz_KdEbPJ7vjNBh50/edit?usp=sharing

              I am planning to swap the housing to the reference one and then compare results for the same materials.

              As soon as I get at least 5 prints per material I'll switch the sensor to test X and Y movement instead (not sure how to to that yet....).

              Please let me know If you would like any specific test to be done.

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                fma
                last edited by 27 Sept 2018, 13:14

                Is you sensor before or after the extruder? In Bowden config, the marks on the filament seem to help reading the movement.

                As I'm using a direct-drive extruder, I'm wondering if I could not build a system which draw some marks on the filament before the sensor, and clean them up after... Any idea what I could use as 'paint'?

                Frédéric

                undefined 1 Reply Last reply 27 Sept 2018, 13:26 Reply Quote 0
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                  brunofporto @fma
                  last edited by brunofporto 27 Sept 2018, 13:26

                  @fma I proposed that too, somewhere here I think 🙂

                  It was not recommended due to the possibility of fragments dirtying the sensor. Also it could buckle there... Then I decided to increase the exposed length of filament with the housing design.

                  But the readings are not bad! They are within a margin and the average is very consistent for each filament so far.

                  They could just design the decision logic based on the average variation... If it keeps within the average for some length it is ok... If the average starts to diverge too much than trigger the alarm 😄

                  I only have 7 prints registered so far so... it may be too early to any assumptions. But I am really impressed by solving my under extrusion issue in one shot based on the average reading!!!

                  undefined 1 Reply Last reply 27 Sept 2018, 13:48 Reply Quote 0
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                    fma @brunofporto
                    last edited by 27 Sept 2018, 13:48

                    @brunofporto said in Laser Filament Monitor - test results:

                    It was not recommended due to the possibility of fragments dirtying the sensor.

                    Mmm could it be possible to find something which does not make dirt? Like a marker? Ideally, something translucent, but reacting with the laser IR, so no need to clean it up...

                    Frédéric

                    undefined 1 Reply Last reply 27 Sept 2018, 13:52 Reply Quote 0
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                      brunofporto @fma
                      last edited by 27 Sept 2018, 13:52

                      @fma A marker would tint the filament.... It is even used for that purpose 😄 Like this: https://www.thingiverse.com/thing:11742

                      But it had no problems so far reading transparent or translucent filaments (one test each....) Besides % readings been different from the base blue ABS they even had a much better approximation of the predicted filament length by the slicing software.

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                        fma
                        last edited by 27 Sept 2018, 13:58

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

                        Frédéric

                        undefined 1 Reply Last reply 27 Sept 2018, 14:33 Reply Quote 0
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                          brunofporto @fma
                          last edited by 27 Sept 2018, 14:33

                          @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.

                          undefined 1 Reply Last reply 1 Oct 2018, 07:53 Reply Quote 0
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                            kraegar
                            last edited by 27 Sept 2018, 18:05

                            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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                              fma @brunofporto
                              last edited by 1 Oct 2018, 07:53

                              @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 1 Oct 2018, 08:51 Reply Quote 0
                              • dc42undefined
                                dc42 administrators @fma
                                last edited by 1 Oct 2018, 08:51

                                @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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                                  fma
                                  last edited by 1 Oct 2018, 09:31

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

                                  Frédéric

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                                    Snypes
                                    last edited by 9 Oct 2018, 11:49

                                    This post is deleted!
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                                      Snypes
                                      last edited by 9 Oct 2018, 11:53

                                      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 9 Oct 2018, 19:58 Reply Quote 0
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                                        kraegar
                                        last edited by 9 Oct 2018, 14:40

                                        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 9 Oct 2018, 15:59 Reply Quote 0
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                                          brunofporto
                                          last edited by 9 Oct 2018, 15:32

                                          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!

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