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    Large all-metal Kossel Delta

    My Duet controlled machine
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    • DjDemonD
      DjDemonD last edited by

      2040 Kossel with 330mm tooling plate mains bed, E3d v6, E3d titan "flying extruder", Hiwin rails, optical endstops.
      Full build log here http://forums.reprap.org/read.php?178,702599
      Printed Parts repository http://www.thingiverse.com/thing:1776462

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      • DjDemonD
        DjDemonD last edited by

        This is the 3rd object it has printed. Very pleased with the controller and the build.

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        • Dougal1957
          Dougal1957 last edited by

          Looking good Can I ask what elastic your using for the Flying Extruder?

          Doug

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          • T3P3Tony
            T3P3Tony administrators last edited by

            Great looking printer and really detailed build log, thanks for putting the photos up. How much of a difference does the flying extruder make?

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            • DjDemonD
              DjDemonD last edited by

              Doug, it's hairbands, the best quality ones I could steal from my Mrs.

              Tony, its hard to say on this machine as it didn't have a bowden setup before but on my kossel mini (which is one of yours) the difference was huge. Whether that's because I didn't get the bowden extruder correctly tuned in the first place is less clear, but I've been flying extruders for about 8 months and I can't really see a downside.

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              • T3P3Tony
                T3P3Tony administrators last edited by

                Cool thanks for the feedback I will have to retrofit one to my big Kossel.

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                • dc42
                  dc42 administrators last edited by

                  @T3P3Tony:

                  Cool thanks for the feedback I will have to retrofit one to my big Kossel.

                  Me too!

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                  • Dougal1957
                    Dougal1957 last edited by

                    I am going to do the Same

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                    • DjDemonD
                      DjDemonD last edited by

                      I've moved my spool holder to the top between the towers, it really doesn't work on the side in this configuration. The only annoyance is when it homes after printing is finsihed the free filament that was pulled out when the extruder was at its lowest position now twists and kinks as it comes back up. Haven't come up with a fix for that except a spool holder that can wind the slack back on in some way, maybe a light spring with a delicate clutch.

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                      • bot
                        bot last edited by

                        I run a loose ptfe tube from the spool to the entry to the extruder, which I bundle with the wiring harness going down to the effector (I have a direct drive on my effector). Works well at keeping the filament untangled, clean, etc.

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                        • T3P3Tony
                          T3P3Tony administrators last edited by

                          Bots plan sounds good. It works for the bowden tube so would also work in this situation.. you might need another point on the frame to be the other end of the tube, like the mini kossel filament guide or similar

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                          • bot
                            bot last edited by

                            If I were to do it again (I'm using 1.75 mm filament keep in mind), I would get the size PTFE tube that they use for 3mm filament, so there was as little resistance as possible. I use a 2mm one now, and when the filament is really kinky (wrinkled not 😉 ) or I've approached the end of the roll and it's really tight, it adds unnecessary friction into the process. I also don't have it attached at the top; the top end of the tube can sometimes come in direct contact with the spool. almost wrapping itself around it. I find this helps keeping the spool spooled, and tidy, without the filament flying off like crazy.

                            I would, however, prefer to secure the lower portion precisely above where it is fed into the extruder, possibly even reducing the tube to the 2 mm variety for the last 5-10 mm or so, to guide it. Right now, it kinda just "finds" its way in there, and I think the precision of the extrusion can be slightly improved by fixing the entry point better.

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                            • DjDemonD
                              DjDemonD last edited by

                              I've always found that whenever I've made spool holders with bearings the filament comes off them much less well, more prone to slip a loop off the reel and spin back and forth, a little bit of friction with the spool holder helps.

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                              • Russ Gries
                                Russ Gries last edited by

                                @Dougal1957:

                                Looking good Can I ask what elastic your using for the Flying Extruder?

                                Doug

                                I recommend using this stuff:
                                https://www.amazon.com/Stretch-Magic-Stretchy-Beading-Clear/dp/B0058E7WOA/ref=sr_1_2?ie=UTF8&qid=1474310375&sr=8-2&keywords=stretch+elastic+beading+cord

                                been using it on mine for years, seems fine! its a type of TPU…

                                good looking build by the way!!!!

                                I think you would also enjoy my build...

                                https://www.duet3d.com/forum/thread.php?id=187

                                its about the same size 🙂

                                ~Russ

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                                • DjDemonD
                                  DjDemonD last edited by

                                  Looks good Russ. Wonderfully detailed build - and you really did build it and make almost everything. I just bought a bunch of stuff and bolted it together. When I get chance I will watch through your videos.

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                                  • Russ Gries
                                    Russ Gries last edited by

                                    Thanks, something about making all the parts, yeah it takes a lot of time but now i can say " i made that" lol there is always something tho like the electronics that are just much better to buy…

                                    also i have a question. my kids got a hold of my printer and ran the arms up and down, breaking some of course. but what ever lol it happens...

                                    my question is do your motors at a stand still at 100% power squeal ?

                                    I ran the Wifi Duet previously but only got about 2 use's out of it and i cant remember if the motor had that bad squeal.

                                    the reason i ask is i know the kids ran those rail's up and down and drove a lot of power in to the drivers... go figure. so i was wanting some one else to confirm that there motors don't make a squeal sound when parked at full power... they still run fine and quiet too but now i'm worried that the drivers may be damaged...

                                    Thanks!!

                                    ~Russ

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                                    • DjDemonD
                                      DjDemonD last edited by

                                      My motors make a high pitched noise when powered up and holding at 100% but its not particularly distressing either that or my ears are old enough that its barely audible to me. My understanding of the stepper drivers is that they have a lot of built in protection so they will shut down to protect themselves and the motors if they are repeatedly asked to perform movements at speeds that are dangerous.

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                                      • DjDemonD
                                        DjDemonD last edited by

                                        Well I never thought I'd see this:

                                        16:15:37Stopped at height -0.150 mm
                                        16:15:31G32
                                        Calibrated 8 factors using 10 points, deviation before 2.630 after 0.001
                                        16:15:00G28
                                        16:07:55G10 P0 S130
                                        16:07:52M140 S85
                                        16:07:49Connection established!
                                        16:07:45Page Load complete!

                                        That's only probing the central 100mm of my kossel XL bed, with my piezo probe using an experimental build surface on glass, but deviation 0.001 - happy with that would be one way of putting it.

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                                        • T3P3Tony
                                          T3P3Tony administrators last edited by

                                          (thumbs up emoji)!

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                                          • roboduet
                                            roboduet last edited by

                                            @DjDemonD Can you try 20-30 random points instead of 10?

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                                            • DjDemonD
                                              DjDemonD last edited by

                                              I can but is there a quick way to do this? or are you defining the 30 random points manually? If so I really don't have the time.

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                                              • roboduet
                                                roboduet last edited by

                                                I'm using simple PHP script to generate random points inside bed. If you are familiar with php I can post script, if not - I can post bed probe g-code file for your bed dimensions.

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                                                • DjDemonD
                                                  DjDemonD last edited by

                                                  Sure Ill try it, if you can post a bed.g file. I am using a 100mm diameter (I have a 300mm diameter bed but I often only probe the inner 100mm for printing small objects. I can't quite get down to the 0.001 levels with the 300mm diameter.

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                                                  • roboduet
                                                    roboduet last edited by

                                                    Please add Sx (x = number of factors) to latest line you want to use:

                                                    For 100mm bed diameter
                                                    For 150mm bed diameter
                                                    For 200mm bed diameter
                                                    For 300mm bed diameter

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                                                    • DjDemonD
                                                      DjDemonD last edited by

                                                      Okay thanks I'll run some of these later. What sort of results have you seen so far?

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