Optimization of interfaces in hybrid structures fabricated by additive manufacturing. The search for more resistant materials with a lower specific weight has favoured the introduction of lattice structures in the components obtained through Additive Manufacturing. Lattice structures, i.e. those structures obtained by repeating an elementary cell until a portion of the part is completely filled, have both stiffness and resistance much lower than that of a solid; therefore they are made in areas with low stress, leaving a portion of solid sufficient to guarantee the desired resistance to the piece itself. From this derives the need to develop hybrid components, consisting of full zones with structural function (bulk) and lattice zones that allow to lighten the component where it is less loaded, reducing the consumption of material, the production time and the weight of the component.