The primary technology used for 3D printing in manufacturing is called additive manufacturing. This process involves creating three-dimensional objects by adding material layer by layer, based on digital 3D models. Different techniques, such as Fused Deposition Modeling (FDM) and Stereolithography (SLA), are employed to produce complex geometries that would be challenging to achieve with traditional manufacturing methods. 3D printing can significantly reduce material waste, enable rapid prototyping, and allow for greater customization in production. This technology has applications across various industries, including aerospace, healthcare, and automotive design.