AS ISO/ASTM 52921:2020 pdf free.Standard terminology for additive manufacturing - Coordinate systems and test methodologies. 1.1 This terminology includes terms, definitions of terms, descriptions of terms, nomenclature, and acronyms associated with coordinate systems and testing methodologies for additive manufacturing (AM) technologies in an effort to standardize terminology used by AM users, producers, researchers. educators, press/media. and others, particularly when reporting...