Architectural reconfiguration system
From Tardis Wiki, the free Doctor Who reference
The architectural reconfiguration system was a component of the Doctor's TARDIS in the shape of a tree that, according to the Eleventh Doctor, "reconstruct[ed] the particles according to your needs." It was basically "a machine that makes machines," perhaps somewhat like a 3D printer. It was, according to Gregor van Baalen's device, "more valuable than the total sum of any currency."
In a timeline that was later erased, Gregor stole and disconnected one of the system's orbs, and the TARDIS defended herself by locking him, Tricky and the Doctor in a continuous loop, as well as sealing the TARDIS doors. (TV: Journey to the Centre of the TARDIS)
