New duet wifi, stepper driver fried

  • I am testing the electronics for my coreXY machine before final assembly- first is the x-y axis before moving on to frame construction and z-axis.

    After setting up power and comms, I hooked up x and y steppers and x/y end stops.

    I sent a "move x axis 10mm" gcode and at that point the X stepper driver exploded and started smoking.

    I held back hysterical crying because my wife was in the room, and disconnected everything. I took a lap and calmed down.

    I then tested all remaining stepper drivers with the motor and confirmed everything else was still functional. All other drivers move the motor without issue.

    Based on the analysis above, I think i must have the 1:1,000,000 defective board. Can someone please help? I have a picture showing the damage (two charred holes in the x-driver chip) that I can send via email.

  • Upload them to and paste the BBB code here.

  • Thanks for the tip

  • Ouch. I have only been on here for a couple of months and seen a small handful of driver meltdowns. So you're not alone.

  • administrators

    I'm sorry to hear that one of your stepper drivers has failed. Please ask your supplier for a replacement Duet under warranty. Also check the wiring between that driver and the motor, and test the stepper motor for short circuits across the winding, between windings, and between the windings and the frame.

    For statistical purposes, please tell us what model of stepper motor was connected to the faulty driver, what current it was set to, and what VIN voltage you were using.

    Given the number of these stepper drivers that we buy, it's not surprising that a few of them suffer infant mortality. However, the rate is higher than we would like, and I raised this in a meeting with the manufacturer last month.

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