FDM is an additive manufacturing method and the prototypes are made by layer by layer addition of semi-molten plastic material onto the platform from bottom to top. The design inspects the effect of the process parameters layer thickness, orientation and layer spacing that affects the tensile strength of the part produced by the Fused Deposition Modelling. Hence, the Optimization of these process parameters of FDM is able to make the system more specific and repeatable and such progression can guide to use of FDM in rapid manufacturing solicitations rather than only producing prototypes. The PLA material was used in this research work to build parts. The experimentation has been completed with the help of Taguchi L9 orthogonal array. Taguchi grey relational analysis is used to optimize the process parameters on multiple performance characteristics such as tensile strength. The proposed method enables decision analysts to better recognize the complete evaluation process and provide maximum tensile strength.