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 idea is to use 3d printers to produce different kinds of connectors, with several types of ways and angles. Students will use these connectors and also sticks in order to create the structures. Sticks can be made of wood, or the can also be designed and printed by students. An example of an exercise could be the challenge of creating the strongest bridge with the minimum of sticks and connectors.