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I need to find enough spare pins to add two extra motor drivers for my big printer build. I am using two motors for the Y and three for Z, I can use the E1 for one of them because I won't be using a second extruder.

I need to find six pins to get two external drivers working. I know the MKS Gen L has 3 servo ports, but one will be going to my BLTouch. Can I reuse the other ports? What other ports can I use for adding extra motor drivers?

I know it also has AUX ports as well but I don't know if they are being using by somthing else.

Ben Crawford
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Have a look at the boards pinout: MKS Gen L pinout from MKSs github

You'll need 3 pins for each additional driver - enable, step, and dir. The AUX-2 connector should give your 8 GPIO pins for that, without losing other functionality like the display.

You might also be able to wire your Y axis motors in series, saving one stepper driver. You could then use E1 and three of the four servo pins for the 2nd and 3rd Z axis stepper drivers.

towe
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