In the 2012 edition of Shell Eco-marathon, the Danish team DTU Roadrunners and their ethanol powered Urban Concept car Dynamo won their class of the competition for the fourth time in row, with an average fuel consumption equivalent to 611 km/l if driving on ordinary petrol. This year the team and Dynamo are back to attempt to improve on last year’s result and push the limits of an ethanol powered car even further. The journey towards this year’s Eco-marathon has been both long and interesting, stressful and rewarding. This year’s version of the eco car Dynamo has been made lighter, more efficient and is the first DTU eco car to be constructed using 3D-printed parts. Instead of trying to design