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Pinda 2 Config Duet 2 Wifi

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  • undefined
    marcel.schiffer
    last edited by 13 Apr 2021, 08:47

    Converted a Prusa MK3s Bear to a Duet 2 Wifi

    Everything worked wonderfully too. Everything is going as it should!

    The printer is enclosed and the offset of the sensor was set at approx. 25 ° Pinda temp.

    So far I have no temp. Compensation of the sensor in it ... But I got the config. already adjusted.

    Now I wanted to let the Duet Pros see if it fits ...

    Pinda Standart.JPG
    Standart Config.

    Pinda comp.JPG
    New Config.

    undefined 1 Reply Last reply 13 Apr 2021, 12:08 Reply Quote 0
    • undefined
      o_lampe @marcel.schiffer
      last edited by 13 Apr 2021, 12:08

      @marcel-schiffer
      Hi, maybe consider using linear scaling formula. See here for a different but similar usecase.

      1 Reply Last reply Reply Quote 0
      • undefined
        marcel.schiffer
        last edited by 14 Apr 2021, 06:57

        My config doesn't work.
        Where do I have to enter the temp parameters?
        In a separate config or in Config.g?

        undefined 1 Reply Last reply 14 Apr 2021, 11:03 Reply Quote 0
        • undefined
          dc42 administrators @marcel.schiffer
          last edited by 14 Apr 2021, 11:03

          @marcel-schiffer, the compensation parameters go in the G31 command in config.g. https://duet3d.dozuki.com/Wiki/Gcode?revisionid=HEAD#Section_G31_Set_or_Report_Current_Probe_status

          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

          undefined 1 Reply Last reply 14 Apr 2021, 21:56 Reply Quote 0
          • undefined
            Kolbi @dc42
            last edited by 14 Apr 2021, 21:56

            With the updated and improved G31, I'm sure that RRF will be on point calculating the compensation for the given temperature. But in my experiences and testing, I concluded that the Pinda-v2 itself was not reliable and no magic that RRF can yield will make it truly better - that's prob why Prusa came out with v3...
            For me, the most accurate way to solve the problem was to shift to BLT - if you don't want to go that route, maybe get a PindaV3.

            undefined 1 Reply Last reply 14 Apr 2021, 22:12 Reply Quote 0
            • undefined
              Argo @Kolbi
              last edited by 14 Apr 2021, 22:12

              @kolbi

              As the inaccuracy is not linear - I think that’s the reason why he wants to add fixed offset values for different temps.
              That’s how Prusa does it with their FW. It’s basically a table with fixed values.

              undefined undefined 2 Replies Last reply 14 Apr 2021, 23:01 Reply Quote 0
              • undefined
                Kolbi @Argo
                last edited by 14 Apr 2021, 23:01

                Hey @argo!
                Yeah, I remember I tried the table from Prusa's firmware with some stepped logic functions, and did testing to derive my own table, but in the end I found that with temperatures held (verified with a flir), during day to day testing, over a 7 day period, the probe trigger was not very repeatable/accurate as it drifted. Granted, the possibility exists it could have been my specific probe that was at fault but it seemed to me that it just wasn't the best sensor for the job. Once I installed a BLT, I consistently got accurate, and repeatable, findings on a continuing basis - with the added benefit that I could change bed surfaces and not have to do any adjusting.
                But, if the pinda is your cup of tea, and I do see benefits of it - I'm not saying they are all horrible, I think it would be best to simplify things and upgrade to a v3.

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                • undefined
                  dc42 administrators @Argo
                  last edited by 15 Apr 2021, 14:35

                  @argo said in Pinda 2 Config Duet 2 Wifi:

                  @kolbi

                  As the inaccuracy is not linear - I think that’s the reason why he wants to add fixed offset values for different temps.
                  That’s how Prusa does it with their FW. It’s basically a table with fixed values.

                  RRF supports both a linear and a quadratic temperature compensation term.

                  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

                  1 Reply Last reply Reply Quote 0
                  • undefined
                    martin7404
                    last edited by 3 Jun 2021, 04:16

                    Can I sugest workaround
                    On my stock MK3 I use different approach. Temp compensation of PINDA2 is off.
                    So just a startup script, I put PINDA 5 mm over the bed, start bed heating, hotend heating and wait until PINDA temp gets 36 degC, then I do mesh calibration.
                    I do the same when dialing Z offset and then with each print. repeatability within 0.02 that is great for my use. Since 2019 my stock MK3 (no M3s or MK3+ upgrades made) just prints

                    Muldex IDEX Duet2+Duex5
                    Custom CoreXY 600x400 Hemera , Duet3+Toolboard+1HCL closed loop
                    Sapphire Pro with Duet2, with closed-loop motors
                    custom high temp E3D tool changer with Duet2+Duex

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                    • undefined
                      ov_darkness
                      last edited by 25 Jan 2022, 18:10

                      I'm planning to do a similar modification (but on stock Mk3s).
                      I think that going to SuperPINDA sensor (v3) which doesn't need these tables at all simplifies the whole operation quite a bit.
                      It cost around 20EUR directly from Prusa.
                      @marcel-schiffer may I ask which enclosure have you used for your Duet?

                      Pro level AM audit, support and sales.
                      Management of 3D scanning and printing services.
                      Focused on Central and Eastern Europe.

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                      • undefined sinole referenced this topic 20 May 2022, 03:28
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