ASTM Committee F42 on Additive Manufacturing Technologies was formed in 2009. F42 meets twice a year, usually in the Spring and Fall (US & non-US, respectively), with about 150+ members attending two days of technical meetings. The Committee, with a current membership in excess of 818, has 8 technical subcommittees; all standards developed by F42 are published in the Annual Book of ASTM Standards, Volume 10.04. Information on the F42 subcommittee structure, portfolio of approved standards, and Work Items under development, is available from the List of Subcommittees, Standards and Work Items below. These standards will play a preeminent role in all aspects of additive manufacturing technologies.