Japrin, Sabri, and Mustaffa Ibrahim. “Fused Deposition Modeling(FDM) Custom Internal Filling Structural Mechanics Simulation”. Research Progress in Mechanical and Manufacturing Engineering, vol. 2, no. 2, Jan. 2022, pp. 334-42, https://penerbit.uthm.edu.my/periodicals/index.php/rpmme/article/view/3773.