Will Baden from Nebraska has developed a plasma CNC machine (which is similar to a regular CNC router but uses plasma) to help him to build and make BIG things. The table controller is a GRBL shield attached to an Arduino and this is sent gcode commands from a Raspberry Pi 3 which is used as the visual interface. He’s entered it into the Hackaday prize competition. You can read a lot more about the project over on Hackaday.io and you can see the machine in action, including the Pi interface, above.