hey, I’m working on a three-piece cam/valve cover for a small automotive engine project, mainly a functional prototype that will see real under-hood temperatures, oil mist, and vibration, but not long-term production use. The parts need to bolt together accurately, hold a gasket seal, and stay dimensionally stable near the cylinder head. I’m planning to 3D print it via SLS, and I’m trying to decide between standard PA12 and carbon-filled PA12, as well as how dense the part really needs to be. For this kind of application, where heat resistance and stiffness matter more than surface finish, is PA12-CF worth the trade-offs, or is standard PA12 at higher density typically sufficient?