https://openinhaler.org/requirements/index.html Before you ship your kit, make sure you understand and include all required items. PCBs - You must provide your own PCBs. Accepted dimensions - 200mm-200mm Accepted base materials - FR4, Aluminum Accepted thickness - 0.4mm-2.4mm Fiducials / Rails - Not required! Parts - You must always provide your own parts. Quantities - For small parts, always provide extras! Labeling - All parts must be labeled, preferrably by value (but REF or MPN works too), unless they are clearly unique and obviously only fit one footprint. Hugo en-us