N°3 power supply



  • Hello,
    I'm Enea, passionate about 3d printing. My first purchase was an anycubic Linear plus (delta).
    I still have not bought the duet wifi because first I want to be sure of the project I have in mind.
    Reading on the site I realized that to use all the features of the duet you have to power it 24v mainly and then also with an external 5v power supply.
    That said, I would not like to replace all the parts of my printer that are 12v so I thought I'd do it like this:
    5v power supply to give it 5v from the outside.
    12v power supply with 2 external mosfets for hotbed and hotend.
    24v power supply for the board, step driver, fan, motors, etc.
    Is it possible to do this?
    In this way I access all the features of the duet and I make it go better?
    I accept advice.

    Thanks for the answers



  • There is nothing stopping you using 12v. I think 24v is advantageous for 0.9degree steppers but it's by no means necessary. Is there something in particular you think you need 24v for?



  • I concur with @adavidm that there's no need to go to 24V in that way.

    There are advantages to 24V. 24V heated beds tend to be higher wattage, therefore they heat up more quickly, and can attain higher temperatures. The hot ends done't make as much difference, since they tend to be about the same overall wattage. 24V can provide more power to the motors, and if you're reaching the limits of the motor voltage, it will make them quieter, but most will run just fine on 12V.

    12V fans are easier to come by, and cheaper.

    5V external power isn't needed if you don't need the Duet to be able to shut down the main PSU, or bring it up from remote. Personaly, I never have my printer running when I'm not there, so an old-fashioned power switch works fine for me, and I run just 24V on my duet machine with a 12V/5A step-sown converter for fans, and some lights.

    So basically, I'd run it at 12V, and if you decide that there's reason to upgrade to 24V later, look at it then.

    All that said, I have my MBot printer which is still using a 12V heated bed, with everything else running off of 24V. This is largely because my 24V power supply for it can't handle a heated bed, though, and I had the MOSFET, heated bed, and 12V power supply already.



  • @adavidm said in N°3 power supply:

    There is nothing stopping you using 12v. I think 24v is advantageous for 0.9degree steppers but it's by no means necessary. Is there something in particular you think you need 24v for?

    I read on an online review that if you use the 24v the TMC2660 go much better and you can use the function to resume printing after a blackout.
    If I can use 12v it's all easier for me.
    If you do not see the difference with the Steppers so much then I could use the 12v.
    Another question:
    I have a hotbed 160w + hotend 40w + motor nema 17 .... how powerful should the power supply be to use the duet wifi?
    I already have a meanwell RSP 320w 12v 26.9A at home. Could it be fine or do you need more?
    Thanks



  • @mroppip said in N°3 power supply:

    Reading on the site I realized that to use all the features of the duet you have to power it 24v mainly and then also with an external 5v power supply.

    Just give it either 12 or 24. No separate 5V needed.





  • thanks guys.

    I did this calculation with 12v:
    160w hotbed
    40w hotend
    2w duet wifi
    18w = 6fan x 3w
    29.7w = (4nema17 x (3.3Vx1.5A)) + 50%
    tot 249.7w + 20% = 299.64w
    with 320w meanwell RSP feeder I should be successful.
    did I do something wrong?


  • administrators

    @mroppip said in N°3 power supply:

    thanks guys.

    I did this calculation with 12v:
    160w hotbed
    40w hotend
    2w duet wifi
    18w = 6fan x 3w
    29.7w = (4nema17 x (3.3Vx1.5A)) + 50%
    tot 249.7w + 20% = 299.64w
    with 320w meanwell RSP feeder I should be successful.
    did I do something wrong?

    That looks OK to me. A 300W or even a 250W PSU is normally sufficient for a single-extruder 3D printer with a bed about 220mm square; although your bed heater has a higher power then most, 160W instead of 120W.



  • thank you all for the support


 

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