Print-A-Part 3d, a Virginia based engineering firm, announces the opening of its innovative 3d parts e-commerce site www.printapart3d.com.  Targeted at small repair shops, hobbyists, and manufacturing companies, who collectively use over 1 billion small parts daily, in the US alone.  Parts offered include industrial parts such as screws, bolts, nuts, and washers.  Products are delivered by digital download as ready to use .STL files, allowing customers to print the necessary parts immediately with an inexpensive 3d printer and no technical staff.