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    Additional stepstick extruders playing nice with onboard tmc2660

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    • raykholo
      raykholo last edited by

      This shows how to add a 3rd extruder via breakout and stepstick: https://duet3d.com/wiki/Using_external_drivers

      Is it possible to use this and the first 2 extruder TMC2660 drivers together?

      I read somewhere that for dynamic microstepping to work all the drivers had to be of the same type, so I would like to get clarification on this.

      Thanks,
      Ray

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      • dc42
        dc42 administrators last edited by

        The restriction is that if you assign more than one driver to the same axis (e.g. to use two or three Z leadscrew drivers), those drivers must use the same microstepping. So there should be no problem with using a stepstick to drive a 3rd extruder, and different extruders can use different microstepping.

        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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        • raykholo
          raykholo last edited by

          Thanks for the clarification.

          There may be a possible typo on that external drivers page, the TB6600 is rated to 4A max, not 5.

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          • dc42
            dc42 administrators last edited by

            @raykholo:

            Thanks for the clarification.

            There may be a possible typo on that external drivers page, the TB6600 is rated to 4A max, not 5.

            I've checked the datasheet and the TB6600 IC is rated at 5A peak, 4.5A "operating range maximal value". So I've changed the value 5A to 4.5A in that wiki page.

            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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            • raykholo
              raykholo last edited by

              Interesting. Every China vendor notes 4.0 peak and the box has settings shown up to 4.0 peak.

              I do see your point about the 4.5 and 5A values concerning the IC itself.

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              • dc42
                dc42 administrators last edited by

                The peak current you can use in practice will depend on how well the chip is cooled.

                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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