What type of technology is commonly used in rapid prototyping?

Additive manufacturing is the correct answer because it encompasses a range of techniques, most notably 3D printing, which is essential for rapid prototyping. This technology allows designers and engineers to create three-dimensional objects layer by layer directly from a digital model. The speed and efficiency of additive manufacturing make it ideal for producing prototypes quickly, enabling iterative testing and design adjustments without the extensive lead times required by traditional manufacturing methods.

In contrast, laser engraving is primarily used for marking or etching surfaces rather than creating entire prototypes. Traditional machining involves removing material from a solid block to create shapes, which is often time-consuming and not suited for rapid iteration. Metal casting, while effective for producing metal parts, requires more setup time and is not as flexible or rapid as additive manufacturing in a prototyping context. Thus, additive manufacturing is favored for its ability to streamline the prototyping process and accommodate design changes efficiently.