Drone Fabricator

One of the technologies created through study of the Lagrange 1 Box, Drone Fabricators are enormous, cylindrical unmanned spaceships over three kilometers in length with mostly hollow interiors that are filled with smaller drones and constructive nanomachines. Designed specifically with megaengineering in mind, Drone Fabricators are mass-scale construction machines which have been used to build every arcology in Sol and most space stations and satellites outside of Earth's orbit. Drone Fabricators use their smaller drones to perform maintenance tasks on themselves or on constructions that have already been built, as well as for deploying prefabricated structures. Constructive nanomachines are used for the vast majority of building tasks, taking materials from storage or from celestial objects carried through space by the Drone Fabricator and putting them together one molecule at a time to form plates, rivets, screws, blocks, bricks, panes and every other fundamental structural building block. Once complete, the nanomachines collectively transport the finished product to the construction site and insert it where desired. Drone Fabricators carry swarms of these self-replicating constructive nanomachines that number in the quadrillions and are capable of building structures in a day that would take decades using conventional technology and construction techniques.