The objective of this study is to assess, in comparison with other additive manufacturing technologies, the metallurgical and mechanical properties that have been continuously changing during the printing process, as well as the flaws and microstructure that influence various failure modes. Since Markforged has received a patent for the atomic diffusion additive manufacturing technology, it has been widely used in the industry. Therefore, this bulk performance examination is very important to match performance with traditional production. Direct metal laser sintering (DMLS) and SLS use a beam to melt powders on a print bed so that components are built layer by layer. In order to make components with a genuinely low porosity content (< 0.5) in a controlled atmosphere, research has focused on controlling production circumstances, such as the laser’s speed and power. This also enables the processing of parts that are sensitive to oxygen. Similar to those used in welding, the powders utilized in this procedure, which range in size from 15 to 50 μm, have been demonstrated to be hazardous to the operator’s health. Researchers looked into other methods for additively printing metals due to health concerns, the high cost of powder-based procedures, and laser safety issues. The microstructure of the laser case-hardened area contains ultrafine solution carbides (M23C6, M7C3, MC, or M2C) dispersed between martensite laths. The microstructure includes retained austenite, martensite, modified ledesite, and fine carbides precipitated on dendrites. The micro-hardness of the laser surface engineered area is significantly increased to 670–810 VHN compared to 480–500 VHN of the as-received quenched and tempered substrate and decreases in the vertical depth of the surface when a narrow soft zone is formed. The hardness of the interface area is 440 VHN. The corrosion resistance of laser surface engineered samples was also slightly improved due to microstructural/compositional homogenization.