Which of the following is NOT a common additive manufacturing technique?

Additive manufacturing is characterized by the process of creating objects by adding material layer by layer, which differentiates it from traditional manufacturing techniques. The method referred to as casting involves pouring liquid material into a mold to achieve the desired shape and is a subtractive or formative process, rather than an additive one.

In contrast, Fused Deposition Modeling (FDM), Stereolithography (SLA), and Selective Laser Sintering (SLS) are all recognized as additive manufacturing techniques.

FDM utilizes a continuous thermoplastic filament that is heated and extruded through a nozzle to build up layers. SLA employs a laser to cure liquid resin into solid layers, while SLS uses a laser to fuse powdered material into solid structures. These methods exemplify the additive nature of 3D printing by creating objects through the sequential addition of materials. This fundamental distinction places casting outside the realm of common additive manufacturing techniques.