You need a prototype with near-series features for testing or presentation purposes?
Classic, fast and inexpensive: polyurethane. Vacuum casting with polyurethane is a rapid manufacturing technique that is used to multiply shaped plastic parts of complex geometries.
With the polyamide casting technique, a rapid prototyping technique as well, high-quality component parts with near-series properties are produced within a very short period of time.
Lost Wax Casting
The proven rapid manufacturing technique lost-wax casting is the technology of choice for comparably fast productions of metal prototypes and small series of five to twenty pieces in a high-grade casting quality.