Vacuum mold casting is a rapid prototyping and low-volume manufacturing technique using silicone molds and vacuum-assisted resin casting to create bubble-free, highly detailed parts. This article offers a complete step-by-step guide covering 3D design, master pattern making, silicone mold fabrication, vacuum casting procedures, and post-processing methods. Ideal for producing functional prototypes and small batch parts in various industries, vacuum casting delivers fast turnaround, cost efficiency, and excellent surface quality.