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This paper describes the implementation of Rapid Prototyping technologies developed for aerospace, automotive, and commercial aluminum casting applications at High Tech Castings, Inc. By utilizing concurrent engineering principles integrated with Rapid Prototyping techniques, the casting development cycle has been dramatically reduced. High Tech Castings, Inc. will present several examples illustrating the comparisons of various Rapid Prototyping technologies incorporated into both prototype and pre-production casting applications. The scope of the evaluations will include the use of Rapid Prototype models, patterns, and tooling.