Additive Manufacturing of Humanoid Robot Components Using eSUN PA-CF and FlexOne 55A Elastic Resin

Humanoid robots require components with substantially different mechanical functions, ranging from rigid and load-bearing structures to flexible and compliant elements. This creates a materials challenge: no single polymer is likely to provide the complete combination of stiffness, strength, flexibility, wear resistance, dimensional stability, and processability required across an entire humanoid robot. At Formnext Asia Shenzhen 2026, eSUN presented a humanoid robot demonstrator manufactured using multiple polymer 3D printing material technologies. According to eSUN's published application information, the robot's main structural components, housings, limbs, and other parts were produced by 3D printing. The structural components were primarily printed with eSUN PA-CF carbon-fiber-reinforced nylon, while selected areas requiring flexibility and cushioning were printed with a one-component elastic resin. [1] [2] This technical application note examines how these two material routes can address different functional requirements in humanoid robot component development. The discussion focuses on material characteristics, additive manufacturing process considerations, lattice-based design concepts, and the potential role of polymer 3D printing in rapid prototyping and low-volume functional manufacturing. This report documents an application example and material-selection approach. It is not an independent robot-level performance validation and does not claim measured improvements in total robot energy consumption, motion speed, actuator life, payload, or system reliability.