Fan voltage and sensitivity/accuarcy of control [SOLVED]

  • Hi there,

    some months ago I switched from ArduinoMEGA/RAMPS/Repetier over ArduinoDue/RADDS/RRF to (now, finally) DuetWifi/RRF.
    I am truely loving to simple yet elegant approach of the software, and the powerful and thought out hardware platform.

    I am still running the setup on 12V, and have been working to have 24V running soon.
    I already know what 24V in general has to offer over 12V, and also what has to be done to make the switch from 12V to 24V.

    Lately I've been wondering which way to go with the fans, and if there are advantages when comparing 5V, 12V and 24V (otherwise almost identical) fans.
    Is there any advantage of one over the other?
    What I could possbily think of is "sensitivity" or "accuracy" in terms of control, but I do have really no "firm" idea if or how this could be the case.
    So if anyone has an answer to this question I'd be glad if you could share it with me 🙂


  • administrators

    It all depends on the fans. 2-wire fans are not designed to have the supply PWM'd, and it's surprising that many of them work as well with PWM as they do. In practice, most brushless DC axial fans work well with PWM (the heatsink fans supplied by E3D are an exception), but many blower fans don't.

    I like to keep things simple, so I use 24V ball bearing fans on my 24V printers. Some people like to use Noctua fans because of their low noise level, but those are only available in 12V and 5V.

    If using 5V fans, be very careful to make sure that there is no chance of the 5V supply wire to the fans coming into contact with any heater wires.

  • So it is essentially a matter of personal preference or part availability, and there are no real differences between fans for different voltages.
    That is what I wanted to read 😉

    Thank you, David.

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