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Designers and engineers in the permanent mold aluminum casting industry have quickly recognized the benefits of prototyping parts early in the design stage. With the increased utilization of three-dimensional (3D) CAD models, the application of rapid prototyping has become more popular. Today, there are numerous technologies available for producing rapid prototypes of cast aluminum parts. The most publicized rapid prototype processes include the group of Additive Rapid Prototyping (ARP) technologies, such as: Stereolithography (SLA), Laminated Object Manufacturing (LOM), Fused Deposition Modeling (FDM), Selective Laser Sintering (SLS), and Solid Ground Curing (SGC). The recent introduction of these technologies have significantly expanded the application of rapid prototyping, in addition to creating an entirely new industry dedicated to the production of rapid prototype parts.