Mechanical Performance of FDM-Printed PLA Joined by Portable Friction Stir Welding: Influence of Infill Density and Tool Pin Geometry. - Almazán, Juan Antonio; Almazán, Miguel Ángel; Marín, Marta M.; García-Domínguez, Amabel; Rubio, Eva María (Polymers (20734360), 2026)