Maestro extruder heater rating



  • Hi everybody, I am new to both 3D printing and Duet3D, but learning fast (I hope ;).

    I am upgrading Ender 3 with DUET Maestro and some other mods.

    Just now I am building new extruder, and I have found a solid extruder heater rated as 50W.
    I don't need all that power, but I like the build quality.
    I have measured the resistance and it is sth. like 10.8 Ohm, which means 53W / 2.2 A (AFAIK).

    What is maximum rating of extruder heater on Maestro?

    I have found 5A somewhere in spesc, but on wiring diagram it says "MOLEX HEATER OUTPUTS ARE RATED TO 2A, SCREW TERMINALS ARE RATED TO 5A". Seems definite, but in some ways inconsistent.

    If 50W is definitely too much, maybe I can use some kind of relay to make it safe (and futureproof)?


  • administrators

    I have found 5A somewhere in spesc, but on wiring diagram it says "MOLEX HEATER OUTPUTS ARE RATED TO 2A, SCREW TERMINALS ARE RATED TO 5A". Seems definite, but in some ways inconsistent.

    It means that if your heater draws no more than 2A, you can connect it to either the terminal block or to the Molex connector. If it draws more than 2A then you must use the terminal block.

    With 24V power, the Maestro can easily handle a 50W heater, but as the current is more than 2A we recommend that you connect it to the terminal block.


 

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