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Several methods have been developed which use rapid prototyping techniques to assist in the creation of prototype metal castings. Methods exist for a number of casting processes such as sand casting, die casting, investment casting, and evaporative pattern casting. In many cases, these methods can reduce both the time and cost required to create prototype castings.

Stereolithography has emerged as a means of quickly creating model and prototype parts without tooling and is becoming a tool designers can use to get products to market faster, reduce development costs, and improve product quality. Applications of stereolithography in the development of injection molded, investment cast, sand cast, and NC machined parts will be covered. In the last several years, a number of market factors have begun to significantly change the nature of product development. Continuing improvements in technology have resulted in significantly shorter product life cycles, requiring that new products get to market in a timely manner. Improved product quality has ceased to be a sales feature and has become instead a minimum requirement to compete in the marketplace. Selling prices have experienced downward pressure from both domestic and foreign competitors.