But Rand wants an extruder, for paste.
I just need to have my extruder stepper motor turn on what the printer starts to run. Can I plug a 100 ohm resistor into both thermistor feeds?
Then both would be satisfied when it cycles. I am surprised it can’t be done by sending a code.
For a Lowrider, you have the wrong Marlin firmware on your board. You have V1’s 3D printer firmware. For an SKR Pro, you want V1CNC_SkrPro_DualLR_2209 from this page.