A 3D printer is a machine that creates three-dimensional objects by layering materials, typically plastic, resin, or metal. It works by following a digital design, which is often created using computer-aided design (CAD) software. The printer builds the object layer by layer, allowing for complex shapes and structures that traditional manufacturing methods may not achieve. 3D printing is used in various fields, including manufacturing, healthcare, and architecture. In healthcare, for example, it can produce custom prosthetics or dental implants. This technology has revolutionized how products are designed and made, offering rapid prototyping and reducing waste.