3D printing technology has been applied in many fields, especially in prototyping products as well as manufacturing specific parts. This study determines the optimal printing parameters when printing metal powder with selective laser melting (SLM) printing method to ensure quality of printed parts. The set of printing parameters includes laser power, layer thickness, and printing speed. In this research, the hatch distance is the same for all printed samples. On the other hand, to reduce the influence of residual deformation in the printed part, the post-printing treatments are applied the same for all printed samples. Experimental research was conducted using the FF-M180D printer; printing material is Titanium alloy to determine the relationship between dimensional accuracy with the printing parameters. To evaluate the geometric accuracy of printed products, a 3D scanner is used to scan the printed samples. The obtained scan data is processed into a 3D digital model. This model is compared to the original CAD model of the part. With the selected printing process parameters, the deviation of the dimension of the printed part with the original 3D-CAD model is in the allowable limit.