 This paper compares two methods of producing AISI 316L stainless steel, additive manufacturing, by a selective laser melting, and conventional production. After the materials are produced, they are subjected to hot rotary swaging at 900 degrees Celsius to improve their performance. The results show that the post-processing significantly reduces porosity and increases hardness. Additionally, the samples produced using selective laser melting have higher fatigue resistance than those made conventionally. The microstructures of the samples also change, becoming less porous and having fewer high-angle grains. Finally, the material constants of the Hensel-Spittle formula are used to predict the hot-flow stress evolution of the steel with respect to its 3D printed state. This article was authored by Petropella, Merrick Bank, Stepping Colony, and others.