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Problems with new Laser Filament Monitor

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Filament Monitor
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  • undefined
    brunofporto
    last edited by 19 Jan 2019, 02:09

    And there was A LOT of dirt inside the casing and the sensor was really nasty with it.... I'll test it tomorrow with some simple parts to check. If a single hair make my optical mouse going havoc imagine with a ball of dirt rolling over the sensor 😄

    I am pretty sure that it was the main responsible for the issue.

    1 Reply Last reply Reply Quote 0
    • undefined
      madhunm
      last edited by 19 Jan 2019, 07:07

      What about somehting like this: https://www.thingiverse.com/thing:3091625
      the part in that thing is just an interposer... but, the skelestruder project has the other parts.
      sensing off of a rotating bearing kinda sorta makes sense to me.

      undefined 1 Reply Last reply 19 Jan 2019, 08:55 Reply Quote 0
      • undefined
        3dmntbighker @madhunm
        last edited by 19 Jan 2019, 08:55

        @madhunm said in Problems with new Laser Filament Monitor:

        What about somehting like this: https://www.thingiverse.com/thing:3091625
        the part in that thing is just an interposer... but, the skelestruder project has the other parts.
        sensing off of a rotating bearing kinda sorta makes sense to me.

        Fantastic idea

        Scratch built CoreXY with Maestro
        Heavily modified Ender 3 with Maestro
        MPCNC work in progress with Duet WiFi

        undefined 1 Reply Last reply 21 Jan 2019, 19:05 Reply Quote 0
        • undefined
          brunofporto @3dmntbighker
          last edited by 21 Jan 2019, 19:05

          @3dmntbighker I am working on a modified version of my casing with this purpose 😄

          undefined 1 Reply Last reply 22 Jan 2019, 00:32 Reply Quote 2
          • undefined
            3dmntbighker @brunofporto
            last edited by 22 Jan 2019, 00:32

            @brunofporto said in Problems with new Laser Filament Monitor:

            @3dmntbighker I am working on a modified version of my casing with this purpose 😄

            When I print your current version I find the PTFE clamping is marginal at best. I have had to drill deeper into the housing to find some purchase for the tube. My printer is partially to blame. While you are at the redesign can I suggest a longer surface area for clamping the PTFE tube. I am using Capricorn tubing now. Actually I may switch to cheap PTFE tube because in this application the Capricorn is actually a detriment. It's more particular about out of tolerance filament and it's not as if it's a bowden tube.

            Scratch built CoreXY with Maestro
            Heavily modified Ender 3 with Maestro
            MPCNC work in progress with Duet WiFi

            undefined undefined 2 Replies Last reply 22 Jan 2019, 11:56 Reply Quote 0
            • undefined
              wilriker @3dmntbighker
              last edited by 22 Jan 2019, 11:56

              @3dmntbighker Actually a short piece of Capricorn tube was recommended coming into and going out the sensor housing because this will better constrain the filament passing over the center of the sensor. But it is hard to use only a short amount if you need longer distances.

              Reg. fixing the tube inside the housing the approach used in this housing by @punamenon might be very interesting. @brunofporto what do you think?

              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

              undefined undefined 2 Replies Last reply 22 Jan 2019, 23:49 Reply Quote 0
              • undefined
                3dmntbighker @wilriker
                last edited by 22 Jan 2019, 23:49

                @wilriker said in Problems with new Laser Filament Monitor:

                @3dmntbighker Actually a short piece of Capricorn tube was recommended coming into and going out the sensor housing because this will better constrain the filament passing over the center of the sensor. But it is hard to use only a short amount if you need longer distances.

                Reg. fixing the tube inside the housing the approach used in this housing by @punamenon might be very interesting. @brunofporto what do you think?

                Thanks, I'll stick with the Capricorn. I'm fortunate I don't need a long section. I think I have no more than 20mm on either end.

                Yeah, that looks like a much better way to capture the tube. I actually don't have issues with the tube coming out, but it's very poorly held in place now.

                Scratch built CoreXY with Maestro
                Heavily modified Ender 3 with Maestro
                MPCNC work in progress with Duet WiFi

                1 Reply Last reply Reply Quote 0
                • undefined
                  brunofporto @wilriker
                  last edited by 23 Jan 2019, 01:12

                  @wilriker said in Problems with new Laser Filament Monitor:

                  @brunofporto what do you think?

                  Nice idea! 😄 An M4 nut may hold that nicely!

                  1 Reply Last reply Reply Quote 0
                  • undefined
                    brunofporto @3dmntbighker
                    last edited by 23 Jan 2019, 20:50

                    @3dmntbighker said in Problems with new Laser Filament Monitor:

                    @brunofporto said in Problems with new Laser Filament Monitor:

                    @3dmntbighker I am working on a modified version of my casing with this purpose 😄

                    When I print your current version I find the PTFE clamping is marginal at best. I have had to drill deeper into the housing to find some purchase for the tube. My printer is partially to blame. While you are at the redesign can I suggest a longer surface area for clamping the PTFE tube. I am using Capricorn tubing now. Actually I may switch to cheap PTFE tube because in this application the Capricorn is actually a detriment. It's more particular about out of tolerance filament and it's not as if it's a bowden tube.

                    I have the same issue... It keeps falling when I am messing with it sometimes. Thank you! I'll increase the length of the hold and also make it tighter a little.

                    Besides the centering the Capricorn tube is also opaque and prevents the light to interfere with the sensor.

                    But If I use the bearing solution there is no problem as the sensor will be shielded by the bearing.

                    1 Reply Last reply Reply Quote 0
                    • undefined
                      brunofporto
                      last edited by 23 Jan 2019, 22:31

                      Something like this 😄

                      0_1548282629383_newcasing.png

                      Now I need to think the thing around the concept 😄

                      1 Reply Last reply Reply Quote 0
                      • undefined
                        3dmntbighker
                        last edited by 24 Jan 2019, 01:38

                        That Prusa one on Thingy manages with one bearing. And weirdly it seems to read the side of the bearing instead of the circumference. Presumably you will want some kind of weak spring in there somewhere keeping tension on the filament without wearing out the tubing.

                        Scratch built CoreXY with Maestro
                        Heavily modified Ender 3 with Maestro
                        MPCNC work in progress with Duet WiFi

                        undefined 1 Reply Last reply 24 Jan 2019, 01:43 Reply Quote 1
                        • undefined
                          brunofporto @3dmntbighker
                          last edited by 24 Jan 2019, 01:43

                          @3dmntbighker yes... I'll leave the "reading" bearing fixed and the second bearing will press against the filament with some type of spring system - like the one used with bmtech extruders.

                          1 Reply Last reply Reply Quote 0
                          • undefined
                            nikker
                            last edited by 24 Jan 2019, 02:05

                            would lightly sanding the bearing also help with the sensor pickup more light?

                            undefined 1 Reply Last reply 24 Jan 2019, 02:08 Reply Quote 0
                            • undefined
                              brunofporto @nikker
                              last edited by 24 Jan 2019, 02:08

                              @nikker Not needed for the sensor as it is perfect for the type of surface the bearing offers. What concerns me is the possibility of the filament slipping the bearing somehow. If this starts happening then the sanding will help.

                              1 Reply Last reply Reply Quote 0
                              • undefined
                                nikker
                                last edited by 24 Jan 2019, 05:48

                                What about some knock off Bondtech gears?

                                undefined 1 Reply Last reply 24 Jan 2019, 07:19 Reply Quote 1
                                • undefined
                                  3dmntbighker @nikker
                                  last edited by 24 Jan 2019, 07:19

                                  @nikker said in Problems with new Laser Filament Monitor:

                                  What about some knock off Bondtech gears?

                                  I don't think you want to distort the filament that much before it reaches the real extruder.

                                  Scratch built CoreXY with Maestro
                                  Heavily modified Ender 3 with Maestro
                                  MPCNC work in progress with Duet WiFi

                                  1 Reply Last reply Reply Quote 1
                                  • undefined
                                    nikker
                                    last edited by 24 Jan 2019, 18:11

                                    good point... I would really like to get a filament sensor. It seems like the magnetic version worked a lot better from what i remember reading however i guess its the laser version that is only available. I have some time to tinker between my current build. I haven't read this whole thread but do we think we can get it to work reliably with some community effort? If so I'll place an order to buy one. My current build has the extruder temporarily mounted on the outside and is wired up and already calibrated so seems like a good time to help? Would be nice if I could contribute to the community after lurking for so long...

                                    1 Reply Last reply Reply Quote 0
                                    • cabal2000undefined
                                      cabal2000
                                      last edited by 29 Jun 2019, 12:34

                                      Where do I find the STL for the Bondtech? Can't seem to locate it anywhere

                                      undefined 1 Reply Last reply 29 Jun 2019, 18:45 Reply Quote 0
                                      • undefined
                                        Adrian52 @cabal2000
                                        last edited by 29 Jun 2019, 18:45

                                        @cabal2000 I have recently put a spring loaded version of the indirect monitor housing on thingiverse (3717158). It seems to work well, especially recording total filament use very accurately.

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