Space Invaders is a team of students with Rueben Pretorius, Mathew Whyte and Jared Rheeders as members. They were South African representatives on 11th World Robot Olympics at Sochi and won the 4th place in Junior High age group.
They developed mobile caterpillar tracked robotic 3d printer powered with LEGO EV3 controller and Arduino. The Delta 3 is a concept of Mars based construction robot that can 3d print buildings, machines and even itself since it is a RepRap.
Here is video explaining their project:
Great work Space Invaders!