It is the need for speed that drives you to have an injection mold prototype built. You might want to beat the competition to the marketplace and don't have time for a hardened production tool. You might also need to see how various components of an assembly actually fit and function; an injection mold prototype is perfect. You can quickly and relatively inexpensively have an injection mold maker build a prototype. Most prototypes last a lot longer than they are guaranteed to, so you might even get some short production out of the deal. For more details visit https://usesino.com/product-prototyping/