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FFF (Fused filament fabrication) and FDM (Fused deposition modeling) are terms used to describe the same 3D printing technology. The difference lies in the terminology: FDM is a trademarked term by Stratasys, while FFF is a more general term used to describe the same process. Both technologies work by melting a filament of material, typically plastic, and depositing it layer by layer to build up a 3D object.