The Replicator is the most versatile consumer-grade 3-D printer available, bringing closer a future where anyone can print toys, car parts, and household items in the living room. Small enough to sit on a desk, it’s capable of printing in two colors of melted plastic. And with nozzles that deposit layers only 270 micrometers thick, it can re-create 3-D models in the minutest of detail. From $1,799