One benefit of 3D printing is the ability for manufacturers to quickly and efficiently fabricate a scale model of a specific part using three-dimensional computer data known as computer-aided design, or CAD. Long gone are the days when it took weeks for an engineering team to produce a mock-up model, which often had to be tweaked multiple times to ensure it was just right. Rapid prototyping accelerates production time by delivering a usable model in a matter of days.