Marlin is the operating system preferred for this build and is the same for my 3d printer so the learning process was less frustrating. I say less because this computer control stuff is a bitch to transition into for a mechanical mind. 

Grbl is a free, open source, high performance software for controlling the motion of machines that move, that make things, or that make things move, and will run on a straight Arduino. If the maker movement was an industry, Grbl would be the industry standard.