Before choosing a prototype, consideration must be given to appearance, performance, and cost requirements. Prototypes are most often chosen because they provide an acceptable version of the desired product. Design changes can be rapidly produced and decoration can be added. The products are normally trim members, covers, and non-load bearing housings. The costs are low since no mold is produced.
Prototypes are useful for both pre-production sales presentations and styling evaluations.
But, the actual performance of the final product cannot be precisely duplicated with a prototype because prototypes are often made from different materials than the final product. The thermoforming process is a quick and economical way to produce shell type prototypes. An instrument housing, top case, tub, and flat shell shaped trim can be easily thermoformed. The wood pattern that is used as the thermoforming mold can be quickly changed to meet desired changes. Thermoformed prototypes can be produced from working drawing within a few hours or days.