What technology does a 3D printer use to create objects?

A 3D printer uses layering materials based on digital models to create objects, which is a defining characteristic of additive manufacturing. This process involves taking a digital design, often created via computer-aided design (CAD) software, and translating it into physical form layer by layer.

During the 3D printing process, materials such as plastic filaments, resin, or metal powder are deposited, fused, or cured in successive layers to build up the final object. This technique allows for a high degree of complexity and detail, which traditional manufacturing methods might struggle to achieve. As each layer is added until the object is fully formed, this method contrasts with subtractive manufacturing processes, which involve cutting away material to create an object.

The other options involve manufacturing methods that do not follow this layering technique. For example, precision welding joins materials together, laser cutting removes material from a larger piece, and injection molding involves creating objects by injecting molten material into a mold. These methods do not utilize the additive, layer-by-layer approach that characterizes 3D printing.