Velasco, Edwar Guillermo, and David Armando Revelo. 2019. “3D Printing: The New Industrial Revolution”. I+ T+ C- Research, Technology and Science 1 (13). Popayán, CO:60-71. https://revistas.unicomfacauca.edu.co/ojs/index.php/itc/article/view/itc2019_pag_60_71.