Hey Guys, is there a way how to get a other Input into GRBL or Marlin then Gcode from a CAM program? like from a other Arduino which receives DMX? I saw somewhere(cant find it again) that someone connected a Wii controller directly to the a RAMPS 1.4. What i wanna do is to get 5 DMX channels into a arduino Uno with a DMX shield (that part i know how to do and is easy) and take those values and send them to a Arduino Mega with a Ramps 1.4 with Marlin or GRBL. Maybe i thaught there is some easy way arround this 
If not ill need to try to get int configuring the Ramp code on my own which will be a hard and long journey but possble i think. Thanks in advance and greetings, Mateo
You will have to write Arduino code that sends the appropriate GCode when it receives a message from DMX.
Of course if you have no need of GRBL or Marlin you could write your own code to operate the stepper motors.