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    Cheapest way to connect 3 Hotends

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    • koreandiundefined
      koreandi
      last edited by

      Hi there,

      can I use a Duet 3 Mini 5+ to hook up 3 hotend / thermistors?
      I need to build a small test-rig. The Setup will have one extruder and can be (manually) switched between 3 hotends. Additional I plan to add a Duet magnetic filament sensor.

      Can the temp0 and out0 also be used with a hotend or is it restricted to hotbed?
      I would like to have a single-board-controller without any extensions boards, if possible. I prefer an ethernet version.

      And another question:
      Is there any general recommendation about 12V / 24V system?
      As I need to purchase the components anyway, it doesn´t matter for me. I have heard that 24 volts runs more smoothly than 12 volts.

      Thanks and have a nice day.

      droftartsundefined dc42undefined 2 Replies Last reply Reply Quote 0
      • droftartsundefined
        droftarts administrators @koreandi
        last edited by droftarts

        @koreandi yes, you can use out0 for a hot end heater, so you can run 3 hotends from one Mini 5+ board.

        Edit: for the heaters, it doesn’t matter too much if you choose 12V or 24V, because the resistance of the heater is different, if for example, your target is 40W per heater. Don’t use heaters meant for 12V with a 24V supply. However, stepper motors benefit from running at higher voltages.

        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

        koreandiundefined jens55undefined 2 Replies Last reply Reply Quote 0
        • koreandiundefined
          koreandi @droftarts
          last edited by

          @droftarts
          Great News.
          Thanks a lot for your answer.

          I think I will go to 24 V even if my setup won´t have any moving axis, except of the stepper.

          Greetings
          Andreas

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          • jens55undefined
            jens55 @droftarts
            last edited by

            @droftarts, I have to disagree with your assertion that heater voltage is mostly irrelevant. The reason for my objection is that with 12V the current doubles over 24V. In theory that should be irrelevant but if you have any connectors in the electrical path for the heater, you can (and I did) run into issues with burning out the connectors. With a 60W heater and 12V you are looking at 5A which is well past the carrying capacity for many small connectors. If you go to 24V you are at 2.5A.
            Line losses also become relevant with the thin gauge wires used in a lot of installs.
            I switched my 12V printers to 24V for that and for the better motor characteristics.

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            • dc42undefined
              dc42 administrators @koreandi
              last edited by

              @koreandi said in Cheapest way to connect 3 Hotends:

              Is there any general recommendation about 12V / 24V system?

              For a new system, always use 24V. It keeps the heater currents lower and allows the motors to move faster.

              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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