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    Duet 3 Scanning Z probe

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    • dc42undefined
      dc42 administrators @zapta
      last edited by

      @zapta said in Duet 3 Scanning Z probe:

      Regarding the temperature affect, is it dominated by hotend or bed temperature?

      We are doing research to determine whether the predominant effect is the temperature of the coil (which is affected by the temperature of the hot end) or the temperature of the bed plate. We have sensors for both. If it proves necessary, we will extend RRF to provide compensation for both.

      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

      zaptaundefined 1 Reply Last reply Reply Quote 1
      • zaptaundefined
        zapta @dc42
        last edited by

        @dc42, I was thinking about the Z probe and meshing issue.

        Since you control also the Z while scanning in X,Y, instead deducing height in mm from the probe, you can just pick a certain probe measurement value and then, while scanning in X,Y, dynamically adjust the Z to maintain that level.

        This will equal-height surface that is well calibrated to mm by the accuracy of the Z steps, and will still be must faster than the stop-and-probe approach of BL Touch.

        BTW, the same approach can possibly also be used with your IR sensor, assuming that its differential mechanism can give you a on-target/above/below indication.

        Does this make sense?

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

          @zapta can you explain a bit more why this would be beneficial vs the current approach for scanning?

          www.duet3d.com

          zaptaundefined 1 Reply Last reply Reply Quote 0
          • zaptaundefined
            zapta @T3P3Tony
            last edited by zapta

            @T3P3Tony, with the current approach, you rely of the scale calibration of the sensor, or the K1 in the linear approximation below:

            L[mm] = K0 + K1*SensorTicks

            With this approach you are K1 agonistic since the Z measurement is inherently calibrated by the Z steps which is also what the printing process uses. In other words, you relax the requirements from the sensor, and at the same time, can still mesh faster than the traditional stop-and-probe.

            Does this make sense?

            EDIT: it's same concept as using a null meter instead of a volt meter. 99b26480-8a3f-476b-a6ed-7e1534bde4a2-image.png

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

              @zapta I see what you mean. It would be slower than the scanning mesh on many machines (depending on Z speed) but would give the Z positions where the sensor reads the same all over the bed. I still don't think it will necessarily be any more accurate though.

              www.duet3d.com

              zaptaundefined 1 Reply Last reply Reply Quote 1
              • zaptaundefined
                zapta @T3P3Tony
                last edited by

                @T3P3Tony, I see.

                I am trying to find a way to speed up touch sensors such as BL Touch but this approach should apply also to other sensors types. My hypothesis is that if instead of a binary state they provide a small hysteresis-free continuous region around a known point, the meshing can be speed up significantly since it requires only minor Z adjustments during the scan to tack that point. Not much different from the mesh compensation during the actual printing.

                Will see how it goes.

                d16a5d72-5269-4d8f-ba08-5ada3002f8e3-image.png

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                • CR3Dundefined
                  CR3D
                  last edited by

                  I want to setup a Scanning Tool for our printers but can not find a wiring schematic in the documentation

                  cc1a6515-d206-4c20-a0fb-862199c1fb32-image.png

                  Can you tell me how to connect pls?

                  PXL_20240116_150402685.jpg

                  Thank you in advance

                  Christian from CR-3D
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                  www.cr-3d.de

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                  oliofundefined bricorundefined 2 Replies Last reply Reply Quote 0
                  • oliofundefined
                    oliof @CR3D
                    last edited by oliof

                    @CR3D the PCB silkscreen points out what the pins are, I can see GND to the left, and C_L (CAN low) and C_H (CAN high) to the right. Second from the left is VCC then, this tracks with the connection description on the documentation page https://docs.duet3d.com/en/Duet3D_hardware/Duet_3_family/Duet_3_Scanning_Z_Probe#description-of-connections

                    The source for 5V depends on the board you use, on the Duet 3 mini 5+ I would choose 5V and GND from IO 4 due to proximity to the CAN header.

                    <>RatRig V-Minion Fly Super5Pro RRF<> V-Core 3.1 IDEX k*****r <> RatRig V-Minion SKR 2 Marlin<>

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                    • bricorundefined
                      bricor @CR3D
                      last edited by bricor

                      @CR3D

                      Disregard this post
                      see later post
                      Wrong board version

                      SZP-Pic.jpg

                      droftartsundefined 1 Reply Last reply Reply Quote 0
                      • droftartsundefined
                        droftarts administrators @bricor
                        last edited by droftarts

                        @bricor That is a V0.1 development board (see PCB bottom right corner). The silkscreen has the CAN_H and CAN_L the other way around.

                        @CR3D The V1.0 boards are:
                        GND - 5V - CAN_L - CAN_H

                        1705424743223.jpg

                        Ian

                        Bed-slinger - Mini5+ WiFi/1LC | RRP Fisher v1 - D2 WiFi | Polargraph - D2 WiFi | TronXY X5S - 6HC/Roto | CNC router - 6HC | Tractus3D T1250 - D2 Eth

                        bricorundefined 1 Reply Last reply Reply Quote 0
                        • bricorundefined
                          bricor @droftarts
                          last edited by

                          @droftarts
                          Thank you for the correction. I grabbed the pic from the current doc.

                          droftartsundefined 1 Reply Last reply Reply Quote 0
                          • droftartsundefined
                            droftarts administrators @bricor
                            last edited by droftarts

                            @bricor I know, I was going to do the same thing until I noticed it was different! So I took a picture of the one I had on my desk that I received earlier this week. @T3P3Tony will put up a proper wiring diagram soon, hopefully.

                            Edit: I've updated the documentation with the above picture: https://docs.duet3d.com/en/Duet3D_hardware/Duet_3_family/Duet_3_Scanning_Z_Probe#physical-connections

                            Ian

                            Bed-slinger - Mini5+ WiFi/1LC | RRP Fisher v1 - D2 WiFi | Polargraph - D2 WiFi | TronXY X5S - 6HC/Roto | CNC router - 6HC | Tractus3D T1250 - D2 Eth

                            CR3Dundefined 1 Reply Last reply Reply Quote 1
                            • CR3Dundefined
                              CR3D @droftarts
                              last edited by

                              Thanks to all! 🙂

                              Christian from CR-3D
                              Homepage:
                              www.cr-3d.de

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                              • Killercdsundefined
                                Killercds @ofliduet
                                last edited by

                                @ofliduet said in Duet 3 Scanning Z probe:

                                Is the STL / STEP for the probe holder availalbe that I see in the picture of the Revo toolboard?

                                9a2979a1-d4aa-4970-ba51-a0676c4f80d1-image.png

                                Any updates on the availability of this specific mount?
                                It seems like it's a modified version of the PCB spacer
                                I would really like to integrate it into my E3D ToolChanger setup

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