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A portfolio company of Chicago-based private equity firm CORE Industrial Partners has acquired Cal-X Inc., a provider of precision machining and sheet metal fabrication rapid prototyping services. Financial terms of the transaction were not disclosed.

Headquartered in Wisconsin, Cal-X offers rapid prototyping and short-run production services through its in-house capabilities. Founded in 2002, the company serves a blue-chip customer base across a mix of end markets, including medical, robotics & electronics, aerospace and transportation. Cal-X’s key capabilities include CNC milling & turning, laser & waterjet cutting, and painting & silk screening.

“The acquisition of Cal-X represents another great example of our commitment to building a leading rapid prototyping service provider,” Prototek CEO Bill Gress said in a statement. “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.”

Cal-X Founder and President Tom Jaskolski added: “Being a part of the Prototek platform is a very exciting opportunity for myself, and the employees of Cal-X, to take our combined businesses to the next level. We look forward to working together with the Prototek team to accelerate growth and continue providing our customers with best-in-class service, technical capabilities and turnaround times for all of their rapid prototyping and short-run production needs.”

Monroe Capital LLC provided financing for the acquisition. Winston & Strawn LLP provided legal representation to CORE and Prototek in the transaction.