This chapter focuses on presenting some concepts about auxetic structures. These models are known to have a negative Poisson's ratio, making them have some improved properties over conventional structures. The auxetics can be constructed with auxetic materials or conventional ones if they adopted the appropriate configuration to generate this behavior. Some configurations (reentrant, double arrowhead, chiral and rotated squares) will be presented in this work and will also be shown the manufacture via 3D printing of auxetic models. The additive manufacturing is a process widely used in the manufacture of auxetics. The application and the optimization of some of these structures will be related. It is expected that at the end of the chapter, the reader will be familiar with auxetic structures.
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