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This research deals with the study and characterization of two materials with different chemical nature, a metallic alloy (Ti-6Al-7Nb) and an FDM 3D-printed thermoplastic polymer (Nylon 6), applying techniques such as metallographic analysis, scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction for the titanium alloy; and Fourier transform infrared spectroscopy and differential scanning calorimetry for the analysis of the Nylon polymer. Among the most relevant results for the titanium alloy stands the presence of two phases in the crystal structure: a primary phase α immersed in a duplex matrix (α+β), with a lower fraction of β crystals. The X-ray analysis showed the existence of Ti and TiO in the sample. For the polymeric sample, it was possible to identify the basic structure with infrared analysis, confirming that the sample is from a Nylon 6 filament. Also, the calorimetric analysis made possible the identification and comparison of the melting temperature for both raw and processed samples.