Relativity Space claims its building-size Stargate rocket mill is the largest metal 3D printer in the world. (Relativity Space)

Relativity Space, the startup developing a small launch vehicle making extensive use of 3D-printing technologies, has brought on board a former SpaceX and Virgin Orbit executive to help grow the company.

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Jeff Foust has more than a decade of experience writing about space policy, entrepreneurial ventures and regulatory affairs. In 2001, he established spacetoday.net to aggregate and summarize the day's space-related news stories. In 2003, he started The...