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    Duet3D PCB delta printer effector sneak preview

    Smart effector for delta printers
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    • dc42
      dc42 administrators last edited by

      This is a temporary lash-up to check the mechanics - the electronic parts are not fitted yet. For the first time ever I have no noticeable effector tilt on my delta. This is after upgrading to Haydn Huntley's magnetic arms, PCB effector and carriage adapters, and linear rails instead of wheeled carriages.

      I hope to get the electronics assembled and tested before the end of this week.



      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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      • DjDemonD
        DjDemonD last edited by

        It looks great David. I have been meaning to ask, but haven't yet as it might be a silly question - is a PCB (and they don't look that thick) stiffer than metal? What do you see as the main advantage to using these?

        Simon. Precision Piezo Z-Probe Technology
        www.precisionpiezo.co.uk
        PT1000 cartridge sensors NOW IN, just attach to your Duet board directly!

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        • dc42
          dc42 administrators last edited by

          Yes the PCB is very stiff. I see the following advantages of using PCBs for this purpose:

          1. As with CNC'd metal parts, they are fabricated to precise dimensions, so that you can get the rod spacing the same at top and bottom by design. But they probably cost less to mass-produce.

          2. They are lighter than a metal effector for the same stiffness.

          3. We can mount connectors and electronic parts on them, including the electronics for piezo or other nozzle-contact sensors.

          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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          • kraegar
            kraegar last edited by

            Looks lightweight, compact, shouldn't flex (due to how compact it is), and precise. Nicely done.

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

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            • DjDemonD
              DjDemonD last edited by

              Thanks, that makes sense. I'll definitely try some as/when you have them for testing.

              Simon. Precision Piezo Z-Probe Technology
              www.precisionpiezo.co.uk
              PT1000 cartridge sensors NOW IN, just attach to your Duet board directly!

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              • Dougal1957
                Dougal1957 last edited by

                Is that a custom E3D Heatsink David?

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                • dc42
                  dc42 administrators last edited by

                  Yes, it's a special made for us by E3D, hopefully to become a standard option when both companies are happy with the design.

                  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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                  • lolorc
                    lolorc last edited by

                    i like the spirit level, I guess you'll replace it with a BMI160 or something !
                    bmi160s on the carriage adapters would be ace as well 🙂
                    4 IMUs to control delta calibration, vibration issues and provide z probe facility, whooohooo that'd be nice ! 😉

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                    • dc42
                      dc42 administrators last edited by

                      We considered using an accelerometer for both bed probing and effector tilt measurement. But the word I have is that accelerometer based probing doesn't work well on softer surfaces such as PEI.

                      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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                      • a96bimmerm3gmail.com
                        a96bimmerm3gmail.com last edited by

                        You can count on me to order a set, that looks fantastic! (I have nearly the same hardware down to the 360mm arms)

                        Being able to mount things to it with standard holes is a huge plus. Like fan brackets and the differential IR sensor

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                        • JeroenZvZ
                          JeroenZvZ last edited by

                          I'am interested too!

                          Any time frame when these come available? Also, can you tell something about how you envisioned to attach fans?

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                          • Hey_Allen
                            Hey_Allen last edited by

                            Definitely interested in a set as well.

                            That looks promising!

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                            • James
                              James last edited by

                              Ditto. Looks clean and light!

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                              • dc42
                                dc42 administrators last edited by

                                On the effector pictured, I envisage a printed part to support fans being attached below the effector using the tails of the ball studs. Or you could clamp a fan assembly to the hot end heatsink. We also have another design prototype with additional mounting holes in it.

                                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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                                • Qdeathstar
                                  Qdeathstar last edited by

                                  Is there an eta on availability/approximate cost.

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                                  • Jimborr
                                    Jimborr last edited by

                                    Guess I know what I am buying in the near future then ;D

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                                    • dc42
                                      dc42 administrators last edited by

                                      I got the built-in nozzle contact sensor working today. If I move the nozzle to 0.1mm below Z=0 then the probe sometimes triggers, and if I move it to 0.125mm below Z-0 then it always triggers. I think this is probably a reasonable sensitivity, because I am using a PEI bed. PEI is known for being soft and causing difficulties with accelerometer-based sensors because of that. I've already identified some design improvements to make the next prototype more sensitive.

                                      We don't yet know what the cost will be. If we can avoid the expense and risk of drilling piezo disks - as we hope to - then it will help keep the manufacturing cost down. At present the component cost is reasonable, but the manufacturing cost may be a little high because there are SMD parts on one side and through-hole connectors on both sides. So at least 2 of the connectors will have to be hand-soldered.

                                      I've also been talking to E3D about a slightly modified hot end mounting method that puts less of the hot end below the effector than the current setup.

                                      As for ETA, we need at least one more round of prototyping and some beta testing before we go to manufacture. Given the turnaround time on PCBs, that makes it at least 8 weeks away from general availability.

                                      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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                                      • kraegar
                                        kraegar last edited by

                                        I think it's reasonable to sell something like that with the hand soldered pieces separate, and charge a small fee to solder them. That's not totally uncommon (Headers on many breakouts, for example) and people at a place in this hobby to want to buy your effectors should be able to handle basic through-hole soldering.

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

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                                        • a96bimmerm3gmail.com
                                          a96bimmerm3gmail.com last edited by

                                          I'm fine with no piezos. And let me know if you need any prototypes on this side of the pond- there's a few PCB houses in california that have done PCB prototypes for me for very cheap.

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                                          • Jimborr
                                            Jimborr last edited by

                                            Any chance you or T3P3 will make custom length Haydn Huntley magnetic arms and sell it all as a kit with the PCB?

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                                            • dc42
                                              dc42 administrators last edited by

                                              I used the onboard nozzle contact sensor to do auto calibration and mesh bed levelling on my 300mm diameter bed delta today. After I remembered to remove the H corrections from bed.g and put in the new diagonal rod length, the deviation for both was around 20um. I'll do more tests tomorrow to check how reproducible the sensor is.

                                              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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                                              • T3P3Tony
                                                T3P3Tony administrators last edited by

                                                @Jimborr:

                                                Any chance you or T3P3 will make custom length Haydn Huntley magnetic arms and sell it all as a kit with the PCB?

                                                We will certainly explore collaborating with Haydn on purchasing his mag arms in larger volumes to bundle with the effectors, once we get closer to a production version. That makes sense for people in the UK/Europe at least (it makes less sense to import them from the US just to ship them back).

                                                www.duet3d.com

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                                                • JohnOCFII
                                                  JohnOCFII last edited by

                                                  I'll keep my eye one this!

                                                  John

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                                                  • bot
                                                    bot last edited by

                                                    I'm curious about that custom e3d heatsink. Does it have the piezo disk integrated? I'd love an e3d hotend with simply three screws to mount it rather than the groove mount, but I'm not certain that I'd like to experiment with piezo disks. Can you clarify what that is in the photos?

                                                    *not actually a robot

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                                                    • Cata
                                                      Cata last edited by

                                                      I don't like the custom heatsink, not easy to leave a standard.

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