Rapid prototyping is the use of digital technologies to design and fabricate physical prototypes faster and more cost-effectively than traditional manufacturing methods allow. Where conventional processes like injection moulding require expensive tooling and long lead times for every iteration, rapid prototyping with 3D printing eliminates both. A design goes from a digital file to a physical part in hours, not weeks.

Prototyping is an iterative process. Engineers design an initial concept, fabricate a part, test it, evaluate the results, and refine the design. This cycle repeats until the design meets all requirements. The faster each cycle can be completed, the more iterations are possible within a given timeframe, and the better the final product.

This process moves through several distinct stages. Proof-of-concept models are the earliest stage, used to validate a basic idea with the minimum functionality needed to test assumptions. Looks-like prototypes focus on appearance, ergonomics and user interaction, helping teams understand what the final product will look and feel like before committing to a full design. Works-like prototypes test the mechanical, thermal and functional systems that make up the product, often developed in parallel with the industrial design process. Engineering prototypes bring design and function together into a near-final version designed for manufacturing, used for user testing and to communicate production intent. Finally, pre-production validation involves small-batch runs to test tolerances, manufacturability and assembly before moving into full production.