Thorough documentation is the most important aspect for knowledge transfer and forms the backbone of adoption. The minimum viable package in our experience includes a comprehensive bill of materials, a library of standardized file types for 3D models, a thoroughly commented codebase, manual, and a permanent repository. It will be the first point of contact that pull sites will use, and will mitigate the effort needed at push sites to support other groups. For potential adopters, a thoroughly documented repository inspires confidence that the open source hardware is well supported, maintained, and achievable to build. To that end, to foster dissemination, hardware design should assume the lowest common denominator in mechanical experience and machine shop support at adopters' sites. This experience is in keeping with other established design philosophies of open hardware . Using aluminum extrusions and other readily available prefabricated parts minimized the necessity for custom hardware and machining in this work. The use of consumer level electronics, like those available from Adafruit and Sparkfun both lowers cost, and reduces reliance on proprietary software , .