Multi-material 3D printing could be seen as a major step forward in manufacturing, as it is capable of making components with complex geometries and with the whole range of mechanical characteristics at the same time. In this project, an attempt was made to understand the viability of MMTAMMP for using in developing complex mechanical parts through the study of effects of layer thickness, infill density, and material selection on stress, strain, and weight. The study focused on three widely used materials: It has been used in Poly Lactic Acid (PLA), Acrylonitrile Butadiene Styrene (ABS), and Nylon. Through simulations done in MATLAB, the research established the extent to which various parameters of printing affect the mechanical characteristics and performance of the parts that are being printed. What the analysis showed me is that the most significant aspect of the structure, the layers, and the infill, is the ability to control how thick each layer should be and how dense they should be on the inside in order to achieve the best strength to flexibility to weight ratio. The values of stress and strain were proved to depend on the kind of the material and the conditions of printing, indicating the necessity of proper choice of the parameters. The outcome shows that to create performant parts for definite industries it is possible to fine-tune multi-material 3D printing. This research offers a useful framework for interdisciplinary research in the field of multi-material additive manufacturing, and practical knowledge on how these methods may be applied for continuing improvement of several contemporary production techniques.