A. Consider the materials and quantities for rapid prototyping manufacturing. Vacuum casting can only make plastic and soft rubber parts. When the quantity is very low, for instance, just 1 piece, vacuum casting is not the most economical option because we need to make a master via CNC machining or 3D printing to make the silicone mold. And one silicone mold lasts 15-20 shots. The more you make, the more costs of silicone mold you can offset.