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Check out this impressive robotic arm from Dan Royer, which wrote 'HELLO WORLD!' for the first time. According to him, "My goal for the year is to design a DIY arduino-based 6DOF robot arm for small businesses and hobbyists. I have been working towards this for two year learning the fundamentals. This video demonstrates my first arm, a 3DOF arm based on the ABB460. It is open source, open hardware, and runs on an Arduino-based controller." If you want to see more look up Marginally Clever.