Connect 9 stepper motors to Duet Wifi 2 (Meanwell 24V-PSU)



  • Hello,

    I am planning on purchasing a Duet Wifi 2 for my own little project as I am building a simple clay 3D printer. For this purposed I will also buy a Meanwell 24V-PSU (350w) and a set of 2A/12V motors.

    I am hoping you can help me with the following. For my setup I want to make use of up to...

    • 4 stepper motors for the Z-axis (motor 1, 2, 3, 4)
    • 2 for the Y-axis (motor 5, 6)
    • 1 for the X-axis (motor 7)
    • 2 (if possible) independent motors for the extruder (motor 8, 9)

    Question 1: For the Z-axis I will use the existing ZA- and ZB-drivers for motor 1 + 2. Could I also connect motor 3 + 4 in parallel to 1 + 2?

    Question 2: Operating motor 5 + 6 in parallel would work as well?

    Question 3: Could I run motors 8 & 9 independently using E0 and E1 (meaning with a different speed)?

    I hope I am making sense here. Thank you for reading this!

    wieman01



  • Q1 Za and Zb are in series not parallell, and given the motors are driven by current this ensures they get the same current. Adding motors in parallell could result in uneven drive current. Possibly simpler to use 1 or 2 motors and a belt or gear drive?

    Q2. Same as Q1, you could run 2 motors in series off the same driver for Y just like Z is doing it, just make a custom wiring loom.

    Q3. E0 and E1 are independent drivers and could be used for anything, but all moves in RepRapFirmware are coordinated and not independent as such. If you tell them to move the same distance they will move at the same speed, if you tell one to move twice as far, it will move twice as fast for both to reach their possitions at the same time.



  • @bearer said in Connect 9 stepper motors to Duet Wifi 2 (Meanwell 24V-PSU):

    Q1 Za and Zb are in series not parallell, and given the motors are driven by current this ensures they get the same current. Adding motors in parallell could result in uneven drive current. Possibly simpler to use 1 or 2 motors and a belt or gear drive?

    Q2. Same as Q1, you could run 2 motors in series off the same driver for Y just like Z is doing it, just make a custom wiring loom.

    Q3. E0 and E1 are independent drivers and could be used for anything, but all moves in RepRapFirmware are coordinated and not independent as such. If you tell them to move the same distance they will move at the same speed, if you tell one to move twice as far, it will move twice as fast for both to reach their possitions at the same time.

    Bearer,

    Thank you, this is great help!

    Q1: I may in fact decide to use a belt instead, thank you. Great thought!

    Q2: Check. Makes sense.

    Q3: Yes, my plan was to use the slicing software of my choice for this. Thanks for confirming this.

    I guess the Duet Wifi 2 will be the right choice for me. A little tinkering will be necessary, but I look forward to that.



  • @wieman01 said in Connect 9 stepper motors to Duet Wifi 2 (Meanwell 24V-PSU):

    Q1: I may in fact decide to use a belt instead, thank you. Great thought!

    if you have enough Vin and will run the motors at a slow speed*, you might get away with 3 motors in series on Z - and 3 would likely be a better choice than 4, as 4 would technically over constrain a plane.

    *) ref the emf calc over at https://www.reprapfirmware.org/



  • @bearer said in Connect 9 stepper motors to Duet Wifi 2 (Meanwell 24V-PSU):

    @wieman01 said in Connect 9 stepper motors to Duet Wifi 2 (Meanwell 24V-PSU):

    Q1: I may in fact decide to use a belt instead, thank you. Great thought!

    if you have enough Vin and will run the motors at a slow speed*, you might get away with 3 motors in series on Z - and 3 would likely be a better choice than 4, as 4 would technically over constrain a plane.

    *) ref the emf calc over at https://www.reprapfirmware.org/

    I will give two motors a shot to begin with. Let's see how that pans out first. I have to test it first.

    Thank you for your thoughts!


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