Metal parts can be manufactured through various 3D printing techniques. The most commonly used 3D printing method for polymers is fused deposition modeling (FDM). However, metal powder mixed with polymer in the form of filament can also be used for cost-effective metal 3D printing. With respect to the other metal-based AM (Additive Manufacturing) process, the FDM of the metal process produces green components. The organic additives are removed from these green components in post-treatment steps. Then, the part is sintered to provide strength. During the sintering process, there is an unintentional shrinkage in every direction. However, because FDM produces green parts, shrinkage of parts depends on the built orientation on the platform and filament deposition approach. In the present work, the FDM of stainless steel 316L has been investigated, a PLA (Polylactic acid) polymer mixed with stainless steel (316L) metal particles (86 wt%), used as a filament in printing. The FDM processing of 316L stainless steel is done on HYREL 3D, and the green part was printed. After printing, debinding process was carried out to remove the binder by heating it at 200 °C for 2 h and then heating it at 450 °C for 2 h, respectively. The part was then sintered at 1380 °C for 4 h. Figure 2 shows a printed green part where the layer-by-layer deposition can be seen macroscopically. Sintered sample was polished on SiC emery paper and then etched with the carpenter’s etchant for a few seconds, and then, a microscopic investigation was carried out. The microhardness of the sample was measured through micro-indentation.