**4. Conclusions and Future Work**

The present study shows an experimental investigation on surface roughness obtained in additive manufacturing processes. Fused Deposition Modeling (FDM) technology was specifically analyzed when manufacturing PLA samples. Several manufacturing parameters (layer height, printing path, printing speed, temperature, and wall thickness) were varied and the results analyzed by means of graphical and statistical analysis. The main conclusions of the investigation include the following:


The results obtained in the present preliminary study will help establish new lines for future work. For instance, the influence of the material on the results should be considered; particularly the influence of the material (PLA) provided by different manufacturers should be conveniently analyzed. The use of larger datasets and higher ranges for the critical factors for verifying the results would be recommended in new experimental studies. Finally, a comprehensive analysis of the influence of wall thickness should be carried out.

**Author Contributions:** Conceptualization, M.P., G.M.-S. and D.C.; Data curation, M.P. and D.C.; Formal analysis, M.P. and D.C.; Investigation, M.P., A.G.-C., M.G. and D.C.; Methodology, M.P., G.M.-S. and D.C.; Project administration, M.P., G.M.-S. and D.C.; Resources, M.P., G.M.-S., A.G.-C. and D.C.; Software, M.P., G.M.-S. and D.C.; Supervision, D.C.; Validation, D.C.; Visualization, M.P., M.G. and D.C.; Writing—original draft, M.P., G.M.-S., A.G.-C., M.G. and D.C.; Writing—review & editing, M.P. and D.C.

**Funding:** This research received no external funding

**Acknowledgments:** The authors would like to thank the support given by the Mechanical and Energy Engineering (TEP250) research group of the University of Jaén.

**Conflicts of Interest:** The authors declare no conflict of interest.
