Duet3D Logo Duet3D
    • Tags
    • Documentation
    • Order
    • Register
    • Login

    Piezo20 probe and piezo kit now available

    Scheduled Pinned Locked Moved
    General Discussion
    33
    423
    99.6k
    Loading More Posts
    • Oldest to Newest
    • Newest to Oldest
    • Most Votes
    Reply
    • Reply as topic
    Log in to reply
    This topic has been deleted. Only users with topic management privileges can see it.
    • Moriquendiundefined
      Moriquendi
      last edited by

      Because the end of a hot end nozzle is not a good contact, it's frequently coated in a layer of gunky/charred plastic.

      Moriquendi

      1 Reply Last reply Reply Quote 0
      • T3P3Tonyundefined
        T3P3Tony administrators
        last edited by

        Boytan

        It would be possible as it could be setup as a switch, and the firmware will accept any sort of trigger as an endstop. (The signal needs to be within the 3.3V range however that is manageable).

        One issue is as Moriquendi described - inconsistant conductivity due to plastic buildup on the nozzle. The other issue is that many(most) bed surfaces are non conductive to you have to have the manual intervention of applying a conductive sheet to the bed.

        www.duet3d.com

        1 Reply Last reply Reply Quote 0
        • DjDemonDundefined
          DjDemonD
          last edited by

          Yes I'd love to use a electrified nozzle and at one point I used to print onto aluminium and considered it. Plastic on the nozzle isn't really an issue if you probe hot. But now I print onto printbite which is super convenient and permanent and about as conductive as ceramic. I'd say most people are using glass or polymer surfaces of some sort.

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

          1 Reply Last reply Reply Quote 0
          • DjDemonDundefined
            DjDemonD
            last edited by

            Updated the tuning guide (long post) above and included a video of how I have it setup which might make it easier to see what I'm on about. https://www.youtube.com/watch?v=F3vi6BOi6sA

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

            1 Reply Last reply Reply Quote 0
            • T3P3Tonyundefined
              T3P3Tony administrators
              last edited by

              Awesome! I linked your post and the video from the Tutorials page:
              https://duet3d.com/wiki/Tutorials#Experimental_Features

              Although at the rate this is progressing it wont be experimental for much longer.

              www.duet3d.com

              1 Reply Last reply Reply Quote 0
              • DjDemonDundefined
                DjDemonD
                last edited by

                Next iteration is to make the nozzle wobble disappear almost completely, I had in mind attaching the upper part of the piezo sensor module to the lower with small smooth rods (or delrin rods?) which would slide into the lower clamp part, and if metal, could be greased. This would result in a very firm nozzle constrained laterally but free to move upwards by a small amount to flex the piezo disc.

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

                1 Reply Last reply Reply Quote 0
                • Dougal1957undefined
                  Dougal1957
                  last edited by

                  DJ

                  PTFE rod is quite cheap and would probably be a better choice than Delrin or steel (Has self Lubricating properties IIRC).

                  a 500mm length of say 10mm Diam is about £2.50 from one of my local suppliers it is available in 4,5,6,8,10 mm diam plus a lot bigger as well.
                  https://www.directplastics.co.uk/ptfe-rod

                  Look forward to seeing your design for it lol

                  Doug

                  1 Reply Last reply Reply Quote 0
                  • DjDemonDundefined
                    DjDemonD
                    last edited by

                    Well here's a preview:

                    I've modded Lykles version as he did his in proper CAD with all the holes geometrically correct etc..

                    Its pretty simple just 4 rods (in the only places they can go without redesigning the clamp (which is a bit beyond my cad skills TBH). Bonded at the top piece or interference fit, and then initially adapted to the clamp by manually filing the holes in the clamp lightly to achieve a fit that allows vertical movement but not lateral movement. Either that or drill the top holes to 4mm and the lower ones to 4.2mm or something like that. I'd grease them if it were steel but maybe won't need to with PTFE. My concern is maybe the PTFE will flex a little and reduce the stiffening effect I'm hoping for, which is why I was thinking delrin if not steel, which is also self-lubricating (although much more expensive and harder to get hold of).

                    What do you think? Very much open to ideas for a better way to do this.

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

                    1 Reply Last reply Reply Quote 0
                    • Zesty_Lykleundefined
                      Zesty_Lykle
                      last edited by

                      Hmm, would the wobble be decreased if we used a bigger peizo sensor?
                      In other words, have a wider base where the hot end is pressed into.

                      Related, how big is the wobble and how does it show up in your printing quality?

                      Lykle
                      Design, make and enjoy life

                      Co Creator of the Zesty Nimble

                      1 Reply Last reply Reply Quote 0
                      • Dougal1957undefined
                        Dougal1957
                        last edited by

                        Problem with Delrin is getting anything smaller than 10 mm Diam.

                        a 500mm long piece of 10mm delrin is about £1.25 so is about half the price of PTFE but I can pop in and get it of the shelf so to speak

                        Would it help if I went and got a length of each and sent you say 100mm of each to try.

                        I would be tempted to drill the top at 10 but the bottom at 10.1.

                        Doug

                        1 Reply Last reply Reply Quote 0
                        • DjDemonDundefined
                          DjDemonD
                          last edited by

                          Doug. Thanks for the offer but 10mm is way too big for what I've got in mind. The whole assembly shown above is only 40mm in diameter and its convenient that it is, it fits inside an effector quite easily. It could be a little bigger but not to accommodate 10mm dia. rods. I'd also be concerned the friction would be quite high with that much surface area to try to slide on. I take your point about the drilling this is why I'd hand file it its easier to control the fit.

                          Lykle no the wobble would be less with a smaller piezo sensor, but then the sensor would flex less and be less sensitive. This might work with an FSR if there is one with a 4-5mm hole in the middle?

                          My first attempt at this version is going to be steel as Im sure I've got some thin rod lying around, doesn't need to be very stiff as they are only 15-20mm long.

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

                          1 Reply Last reply Reply Quote 0
                          • Dougal1957undefined
                            Dougal1957
                            last edited by

                            OK So would you like me to get some 4mm PTFE rod it could be stiffened with some bigger stuff round it maybe

                            Doug

                            Tell you what I need to print the parts so if you could send me the files (If you haven't put them on TV Yet) I will get some 4mm PTFE Rod and give it a try?

                            1 Reply Last reply Reply Quote 0
                            • DjDemonDundefined
                              DjDemonD
                              last edited by

                              I haven't put this one on TV yet as its totally untested. but here they are:
                              https://1drv.ms/u/s!Apv79JfGbPIwgu08dlMg3WjnTvCcQA

                              I'll host them there for a while until they go on thingiverse.

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

                              1 Reply Last reply Reply Quote 0
                              • DjDemonDundefined
                                DjDemonD
                                last edited by

                                If you have some PTFE rod spare, I'd try it if you're having success with it. Just found some nice chromed steel 4mm rods lying around at work.

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

                                1 Reply Last reply Reply Quote 0
                                • Moriquendiundefined
                                  Moriquendi
                                  last edited by

                                  I wonder whether you're over engineering this? The movement of the hot end is tiny, less than 0.5mm and probably less than 0.1mm. I would suggest that a compliant mechanism would allow the necessary movement with minimum weight while maximising lateral rigidity. I've got a pic but nowhere to host it, what's the best way round that?

                                  Moriquendi

                                  1 Reply Last reply Reply Quote 0
                                  • Dougal1957undefined
                                    Dougal1957
                                    last edited by

                                    Email sent Idris I will host it for you and give a link in this thread.

                                    Doug

                                    1 Reply Last reply Reply Quote 0
                                    • Dougal1957undefined
                                      Dougal1957
                                      last edited by

                                      Moriquendi's clamp

                                      1 Reply Last reply Reply Quote 0
                                      • Moriquendiundefined
                                        Moriquendi
                                        last edited by

                                        This is a rough representation of the lower part (Blue and Red) of DjDemonDs effector and would bolt to the upper part at the four corners with standoffs.

                                        Moriquendi

                                        1 Reply Last reply Reply Quote 0
                                        • Dougal1957undefined
                                          Dougal1957
                                          last edited by

                                          How would it clamp the E3D Heatsink firmly?

                                          1 Reply Last reply Reply Quote 0
                                          • Moriquendiundefined
                                            Moriquendi
                                            last edited by

                                            It would need to be split into two parts like DjDemonDs, I just knocked it together to demonstrate that you don't need dedicated bearings and shafts, you can achieve the same thing by arranging for flex in specific areas. I've been using a similar mechanism to support my bed with piezo sensors for months with no issues.

                                            Moriquendi

                                            1 Reply Last reply Reply Quote 0
                                            • First post
                                              Last post
                                            Unless otherwise noted, all forum content is licensed under CC-BY-SA