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The Arduino CNC Shield V3.
Have you heard about the GRBL project yet? See the links below the Arduino CNC Shield V3 is GRBL ready.
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.
This CNC shield is 100% compatible with this project and will get you going in record time.
The Grbl wiki page can be found here: https://github.com/gnea/grbl/wiki
The Grbl project page and software can be found here: https://github.com/gnea/grbl