Prototek, a leading rapid prototyping service provider and a portfolio company of CORE Industrial Partners, a Chicago-based private equity firm, has agreed to acquire Cal-X, a provider of precision machining and sheet metal fabrication rapid prototyping services. Financial terms were not disclosed. “The acquisition of Cal-X represents another great example of our commitment to building a leading rapid prototyping service provider. We specialize in delivering the impossible and now we will bring this service on a nationwide scale. Cal-X rounds out our portfolio of capabilities and services that places us as the logical choice of rapid prototype providers.” Bill Gress, Prototek Chief Executive Officer.