Responsibilities include determining fabrication strategies from research requirements, selecting tools and materials, defining machining parameters, developing process plans, evaluating tradeoffs among dimensional accuracy, surface quality, fabrication time, and repeatability, and implementing process improvements based on engineering analysis and experimental results. Responsibilities include diagnosing fabrication errors, resolving toolpath or setup issues, modifying machining parameters, improving fixture and tooling approaches, and making engineering decisions needed to achieve required dimensional accuracy, surface finish, and repeatability.