It’s not quite a Star Trek replicator, but the Fab@Home project will let you make 3D objects for ~$2,500.  It can handle many types of material, from silicone to chocolate, letting you build lego bricks or chocolate forms.  Ars Technica has more on this first venture into affordable fabrication at home.
“Malone’s goal was to build something cheap and reliable, something that hobbyists could use to kickstart a “home fabbing revolution” that would have analogues to the personal computer revolution that hobbyists helped to launch in the early 1970s. The result was Fab@Home, an open-source project that provides drivers, applications software, and detailed design plans for assembling a three-dimensional desktop fabricator. Total cost: under $2,400.”

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