Additive Manufacturing

Additive manufacturing, commonly called 3D printing, is a family of fabrication processes that construct a part by adding material incrementally from a digital 3D model, almost always in successive layers. This stands in direct contrast to subtractive methods such as milling and turning, which remove material from a solid billet, and formative methods such as casting or injection molding, which force material into a tool or die. Because AM builds geometry directly from CAD data with no part-specific tooling, it excels at complex internal channels, lattice structures, consolidated assemblies, and low-volume or one-off parts that would be uneconomical to tool for.\n\nThe authoritative reference is ISO/ASTM 52900, Additive manufacturing - General principles - Fundamentals and vocabulary, whose 2021 second edition organizes AM into seven process categories: vat photopolymerization, material extrusion (the familiar FDM/FFF desktop method), material jetting, binder jetting, powder bed fusion (which includes metal techniques like selective laser melting and electron beam melting), directed energy deposition, and sheet lamination. The standard treats additive manufacturing as the broad umbrella term and reserves 3D printing for the narrower notion of depositing material through a print head or nozzle. On the shop floor, the digital workflow runs from a CAD model to an STL or 3MF mesh, then through slicing software that generates toolpaths and support structures, then to the machine, followed by post-processing such as support removal, depowdering, heat treatment, HIP, and machining of critical surfaces.\n\nManufacturers adopt AM for rapid prototyping, jigs and fixtures, tooling inserts, spare parts on demand, and increasingly for flight-critical and patient-specific end-use production. Aerospace and medical device makers lead metal AM because the geometry freedom enables lighter, topology-optimized brackets and porous implants, while job shops use polymer printers to compress prototype lead times from weeks to hours. Metal AM has grown sharply, driven by titanium and nickel-superalloy parts where buy-to-fly ratios and tooling costs make casting or machining prohibitive.\n\nWithin a unified platform, AM is treated as just another routing operation alongside conventional work centers. Build files, machine parameters, and material lots are tracked for traceability; powder lot genealogy and post-process steps feed the quality system; and finite scheduling sequences build plates across printers with long cycle times. ERP captures machine time, powder consumption, and energy in job costing, while MES collects in-process sensor and real-time monitoring data. Engineering revision control links the printed part back to its CAD model and BOM, closing the loop between design intent and as-built reality.