Order 5,000 from a prototype shop and you’ll wait while they hand-run a process built for one-offs. A custom manufacturing shop that sells fabrication services rather than the machines behind them, with sheet metal work sitting alongside CNC machining, custom fasteners, injection molding, die casting, and 3D printing. Local job shop. A local job shop works when you want to inspect and iterate in person. Get a sample part in hand before you commit a production order.