I want to connect 4 extra stepper motors to my ramps 1.4 board using a CNC shield. I'll be running the extra motors using repetier host. However, i have no idea how to change the marlin software. The purpose of my project is to build a 3D bioprinter which would run 4 syringe drives which would be sliced along with the extruder to print filament and then tissue samples. I wonder if anyone can help with a wiring diagram from the ramps Aux 1 and 2 and the necessary code to change the marlin software.

Many thanks for your help

Jim Gillies