3D printers were machines that could replicate physical objects.
In 2013, Devlin Futuretech manufactured 3D printers which the Nestene Consciousness used to create Autons. (AUDIO: Vanguard)
Missy demanded a 3D printer among her list of requested "toys" for helping the Twelfth Doctor defeat the Monks. (TV: The Lie of the Land)
By the early 2020s, the Forge were able to perfectly replicate a slab of prime steak with a 3D printer. (PROSE: Project: Wildthyme)