Design of modern electro motors for consumer goods is becoming a challenging task as several objectives need to be taken into account, such as high quality, low cost, long lifespan, and maintenance free operation. While up-to-date computer technologies already enable effective multi-objective design, it is reasonable to apply them to industrial applications. Our intention is to combine knowledge from two areas, i.e., the industrial development of electric devices and the computer science, with the aim to improve the whole design process. Therefore, a stigmergic (i.e., natural-inspired) optimization method is used to improve design of an electro-motor casing with reduced production costs.