Manufacturing hardware (devices, machines, objects) is a challenging task. High-volume sales can offset costs of production, but niche products struggle with viability. Distributed production of open source designs---having people build their own niche products---is a possible alternative. In this talk, I will describe how digital fabrication like 3D printing, CNC milling, etc. can be used for distributed production and contrast that approach with centralized production. Through example open source hardware projects I will highlight design features that work well and less well, how community support is crucial for replication, and give recommendations for how to make more distributed production possible.