Next to Home Depots enormous bags of potting soil, multi-packs of light bulbs, and other home improvement goods is something new this week: 3D printers. The chain began stocking printers made by MakerBot in its stores in three states: California, Illinois, and New York as part of what Home Depot described to Bloomberg as a pilot. The company hopes people will buy them to print one-off parts for projects, but still come back for things that cant be printed out, as well as to restock on spools of filament. MakerBot already has three retail stores of its own, and is available at Microsoft stores, Micro Center, and online.