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This module deals with different AM processes which uses wire as a feedstock material to construct a 3D object. The classifications have been made based on various sub-systems used in wire based AM technology. There are multiple options available as wire material like plastic, wax, composites, and metals; each of the material incorporated in part fabrication required different set of machine arrangement. All commercially available wire based AM process have been covered in this module. Moreover, the function of essential accessories and influence of design parameters are also discussed under individual systems. The most important factors in metal wire based AM technology are omnidirectionality, geometric processing, single bead, multi-bead disposition strategy. All mentioned factors need to be thoroughly studied and planned according to machine environment before starting the material deposition or part fabrication.