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    Problems with new Laser Filament Monitor

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    Filament Monitor
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    • 3dmntbighkerundefined
      3dmntbighker
      last edited by

      For the record in my case lashing down the sensor made a big difference. Of course many filaments simply don't work with this sensor. But keeping the sensor from moving around was very important. I don't know how it even works with a bowden 😉

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

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      • brunofportoundefined
        brunofporto @dc42
        last edited by

        @dc42 said in Problems with new Laser Filament Monitor:

        Have you made sure that there is a only very short piece of PTFE tubing between the filament monitor and the extruder inlet, secured at both ends, so that when the extruder reverses the filament is forced to run back through the sensor, and not bunch up between the sensor and the extruder?

        Yes, that is for sure 😄 Almost touching the extruder. And great to know that there is a firmware update related to the sensor. Thank you very much! You also made me remember that there is a loooong time since the last time I checked for debris over the sensor. I'll check on that.

        Also...

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

        For the record in my case lashing down the sensor made a big difference. Of course many filaments simply don't work with this sensor. But keeping the sensor from moving around was very important. I don't know how it even works with a bowden 😉

        The sensor casing IS moving due to a bad positioning - it is perpendicular from where the filament comes and it surely started to get worst readings after that... I do not know why I did not correlate this before 😄 thank you!

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        • brunofportoundefined
          brunofporto
          last edited by

          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.

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          • madhunmundefined
            madhunm
            last edited by

            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.

            3dmntbighkerundefined 1 Reply Last reply Reply Quote 0
            • 3dmntbighkerundefined
              3dmntbighker @madhunm
              last edited by

              @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

              brunofportoundefined 1 Reply Last reply Reply Quote 0
              • brunofportoundefined
                brunofporto @3dmntbighker
                last edited by

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

                3dmntbighkerundefined 1 Reply Last reply Reply Quote 2
                • 3dmntbighkerundefined
                  3dmntbighker @brunofporto
                  last edited by

                  @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

                  wilrikerundefined brunofportoundefined 2 Replies Last reply Reply Quote 0
                  • wilrikerundefined
                    wilriker @3dmntbighker
                    last edited by

                    @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

                    3dmntbighkerundefined brunofportoundefined 2 Replies Last reply Reply Quote 0
                    • 3dmntbighkerundefined
                      3dmntbighker @wilriker
                      last edited by

                      @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

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                      • brunofportoundefined
                        brunofporto @wilriker
                        last edited by

                        @wilriker said in Problems with new Laser Filament Monitor:

                        @brunofporto what do you think?

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

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                        • brunofportoundefined
                          brunofporto @3dmntbighker
                          last edited by

                          @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.

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                          • brunofportoundefined
                            brunofporto
                            last edited by

                            Something like this 😄

                            0_1548282629383_newcasing.png

                            Now I need to think the thing around the concept 😄

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                            • 3dmntbighkerundefined
                              3dmntbighker
                              last edited by

                              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

                              brunofportoundefined 1 Reply Last reply Reply Quote 1
                              • brunofportoundefined
                                brunofporto @3dmntbighker
                                last edited by

                                @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.

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                                • nikkerundefined
                                  nikker
                                  last edited by

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

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

                                    @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.

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                                    • nikkerundefined
                                      nikker
                                      last edited by

                                      What about some knock off Bondtech gears?

                                      3dmntbighkerundefined 1 Reply Last reply Reply Quote 1
                                      • 3dmntbighkerundefined
                                        3dmntbighker @nikker
                                        last edited by

                                        @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

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                                        • nikkerundefined
                                          nikker
                                          last edited by

                                          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...

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                                          • cabal2000undefined
                                            cabal2000
                                            last edited by

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

                                            Adrian52undefined 1 Reply Last reply Reply Quote 0
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