Creating molds from 3D Printing?

[Larry]

Has anybody ever experimented with creating molds via 3D Printing and then pouring liquids into the mold to create the object? Kind of the inverse of what we traditionally think of when 3DP'ing.

This is actually what the European Space observatory is doing with 3D printing. They make molds of parts for their telescopes with 3D printers and then pour aluminum into those molds.