Following up on a partnership announced last December between Lockheed Martin [LMT] and Sintavia, the two companies said on Wednesday that Lockheed Martin has made an investment in the additive manufacturer that will expand their collaboration.

Terms of the equity investment were not disclosed.

Sintavia designs and manufactures 3D printed mechanical systems such as multi-circuit heat exchangers, complex thermodynamic chassis, and monolithic colling pumps for aerospace, defense, and space contractors. The Florida-based company has been supplying additive manufactured parts to Lockheed Martin since 2019 and in late 2022 the companies partnered to expand research of metal additive manufacturing opportunities as an alternative to castings and forgings.

“The investment will directly strengthen our development and testing capabilities with the thermodynamic components that we supply Lockheed Martin, specifically next-generation heat exchangers enabled by additive manufacturing technology,” a Sintavia spokeswoman told Defense Daily. The investment will allow us to greatly expand this internal capability, so that we can broaden the already successful supplier relationship that we have with Lockheed Martin across other Lockheed Martin platforms.”

Brian Neff, CEO and founder of Sintavia, said in a statement that “This investment not only cements the relationship between Lockheed Martin and Sintavia, but also demonstrates the fact that Sintavia’s thermodynamic components—optimized through additive technology—are sought after by the largest and most substantial prime integrators within the aerospace and defense industry.”

Sintavia’s financial adviser on the deal was RBC Capital Markets.