Currently, conductive polymers have attracted considerable interest due to their ability to transport electrical charge, making them key materials for the development of innovative electronic and biomedical devices. Among them, polyaniline (PANI) stands out for its biocompatibility, although its processability is limited. One strategy to overcome this disadvantage has been to combine it with polymers such as polylactic acid (PLA), obtaining processable and conductive materials, albeit with a significant reduction in tensile strength (up to 50% lower than virgin PLA).

This work proposes the incorporation of carbon nanotubes (CNTs) into the PLA/PANI mixture, with the aim of reinforcing the mechanical properties without sacrificing electrical performance. The composites obtained were processed by extrusion to generate filaments compatible with 3D printing, opening the door to the design of multifunctional materials that integrate lightness, conductivity, and processability, with great potential in emerging technological applications.