**1. Introduction**

Since their advent, Rapid Prototyping technologies, nowadays known also as Additive Manufacturing or 3D printing methods became widely used in different applications that are used both, in industrial and medical domains [1, 2]. The benefits and advantages of using such modern manufacturing methods based on adding layers of materials, instead of removing (subtracting) material are multiple, consisting in the efficiency in producing parts more rapidly and with a minimum waste of material in the end [3]. Besides the advantages of these methods, there are also some disadvantages that consist in the performances that are reached using these types of technologies in terms of accuracy, roughness, and density in close correlation with the type of materials that are used in the additive manufacturing (Rapid Prototyping) methods and complexity of the parts that are required to be manufactured [4].
