With the use of injection molding and 3D printing, materials with complex shapes can be mass-produced with better productivity and quality working efficiency. Proper injection speed, temperature, pressure, and the right mold design are crucial in producing higher-quality products. In order to be competitive with regard to business and marketing in the manufacturing industries, engineers will need to boost productivity and maintain a high standard of quality with efficient manufacturing. This paper discusses the role of injection molding and 3D printing in improving productivity and enabling the efficient manufacturing of products. This study also makes an effort to review the various methods and procedures now in use for 3D printing and injection molding.