What distinguishes Fused Deposition Modeling from other rapid prototyping methods?

Fused Deposition Modeling (FDM) is primarily distinguished by its technique of extruding filament materials to create parts layer by layer. This process involves melting a thermoplastic filament, which is then deposited through a nozzle in precise patterns. As the material cools, it solidifies, forming the desired shape. This method contrasts with other rapid prototyping techniques, which may involve different principles.

For instance, some processes use liquid resins that undergo curing with ultraviolet light, while others might rely on mechanical cutting tools to shape solid blocks of material. There are also methods that utilize lasers to fuse powdered materials together. FDM's unique approach of layer-by-layer extrusion from a solid filament is what sets it apart in the field of additive manufacturing.