Rheinmetall UK Adopts FFF for Challenger 3 Tank Production

Rheinmetall UK, a key land defense contractor for the British Army, has officially integrated additive manufacturing into its production process for air ducting components on the Challenger 3 Main Battle Tank program. This move signifies a transition from traditional manufacturing methods to in-house polymer printing for on-demand part creation, with potential implications for how defense manufacturers manage complex upgrade projects.

The Challenger 3 program faced spatial constraints within the vehicle's existing architecture, making it difficult to adapt the traditional method of assembling ducting from flexible tubing and sheet metal junction boxes. Alternative manufacturing routes like injection molding and rotational molding were considered, but the high upfront tooling costs presented a significant financial and schedule risk, especially given the likelihood of design changes during vehicle development.

Additive manufacturing offered a solution by eliminating the need for traditional tooling. After evaluating SLA, SLS, and FFF technologies, FFF with ULTEM 9085 was selected. The material met stringent requirements for flame retardance, low smoke, and low toxicity, essential for a combat vehicle environment. The process also aligned with Rheinmetall UK's existing expertise in desktop FFF for prototyping, minimizing the learning curve for production-grade applications. Minor issues with surface finish and air permeability were resolved through post-processing techniques.

Rheinmetall UK opted for in-house production to maintain control over cybersecurity requirements, as the external supply chain lacked the necessary Cyber Essentials+ accreditation. In-house manufacturing also facilitates rapid design iteration and knowledge accumulation. The company chose the miniFactory Ignite FFF system due to its large build volume, competitive pricing, and open-material architecture, which allowed for direct feedstock purchasing and reduced part costs. The system's Finnish origin was also considered a lower cyber risk, and local technical support mitigated downtime risks.