This is part of the series of 30 exercises developed during the E3D+VET program. The aim of this Erasmus+ program is the immersion in 3D printing of VET centres (website: ). The model consists of 10 pieces printed in 3D. The largest parts to be print are the blades. Each of them is made with three solids joined together that form a single piece. The blades are designed with a C-shape. These are linked to each other with two connectors. The triangular shaped connectors are designed in such a way that inside them there is the space to link the blades. This structure, in turn, thanks to opposing holes in the connectors, is connected to the central axis formed by three pieces linked together. Everything is blocked with a circular gasket placed under the last connector. In turn the entire structure is connected to a base to allow its balance.