Hello, I am trying to use this stepper motor, which has a current rating of 3.5A per phase. This is over the recommended rated current of 3A, but I was wondering if I can still use the built-in driver, but just run the motor at 60-80% so that the current is in the recommended rating. If this is not possible, I will look into using an external driver.

Thanks as always!

It can either be done manually by homing the drivers through their external program, or I could get fancy and tap into their I/O and send a signal from the Duet to the drivers when I want them to home. I am leaning towards the second option, because that would allow me to simply tell the drivers to home, and then have the Duet wait for the "homed" or "at endstop" signal. The drivers come from the same company as the linear motors, and have their own built-in system for movement, homing and fault (over velocity/maximum position limiting) handling. I am simply trying to use the Duet and its integrated 3D printing capabilities to command the X/Y/Z axes of the machine as necessary for printing.

Again, I am not sure this is possible using the stock firmware on the Duet, as the physical limit switches are connected to the external drive system. I would be making my own "limit" or really "homing" digital outputs using the configurable I/O of the external drivers.

Thanks for the help. I understand this is an unconventional use of the Duet, but I have high hopes that I will be able to make it functional!

Hello,

I am using a Duet Ethernet and plan to use external drivers for all three of my axes. These external drivers all internally manage the limit switches and homing, so I do not need the Duet to manage these tasks. I was wondering how I could configure the homing procedures for the x and y axes such that the Duet simply waits for a digital HIGH signal from my external drivers telling it that both the x and y axes are homed to their zero positions. My hope is to use the built-in X/Y axis limit switch headers on the Duet. I can configure my external drivers to output a digital signal of 3.3V whenever the drive is at the "home" zero position for each axis.

If this is something that is possible to configure and you could give me a few pointers as to how to do it, I would appreciate it greatly!

@dc42 Thank you for taking the time to explain that to me and answer my questions! If anything else comes up, I will be sure to ask here.

Hello! I am using a Duet Ethernet along with a Duex5 and am looking to connect four external drives. It is my understanding that you cannot use the default x/y/z headers on the Duet Ethernet because these output post-processed signals from the TMC2660 driver chips. Instead, you have to remap the external drivers to headers 5-8. I also wanted to clarify something from the wiki. It says that you cannot use the test points for the x/y/z drives as inputs into an external driver, but if I am only using the points for step direction input into my external driver, would this be okay? I assume not, but I figured I would check!

Additionally, if I do remap the x/y/z to drives 5-7, is it possible to remap the built-in (but now unused) x/y/z drivers/headers to use as additional extruders? I would also need to remap the heater output for drives 5-7 because the x/y/z drives do not normally have heaters. If this is possible, it would be extremely helpful!

Thanks in advance for the advice!