Suryadarma, E. H. E., P. W. Laksono, and I. . Priadythama. “Optimal PLA+ 3D Printing Parameters through Charpy Impact Testing: A Response Surface Methodology”. Jurnal Optimasi Sistem Industri, vol. 23, no. 1, July 2024, pp. 76-91, doi:10.25077/josi.v23.n1.p76-91.2024.