Abraheem Hadeeyah وآخرون 2023. Improve the surface roughness of PETG products in FDM 3D printing process with addition of Carbon Fiber. Bani Waleed University Journal of Humanities and Applied Sciences. 8, 3 (2023), 385–389. DOI:https://doi.org/10.58916/jhas.v8i3.172.