Explore the process of designing and manufacturing an injection-molded case for Tomu, a small USB computer that fits entirely within a USB Type-A slot. Learn about the challenges of creating a compact plastic enclosure, from reading mechanical diagrams to using open-source software for design. Discover the intricacies of injection molding, including decision-making factors for transitioning a project to plastic production and interpreting injection-molded parts. Gain insights into open-source injection molding and the entire manufacturing process, from concept to final product. This 47-minute conference talk from linux.conf.au provides valuable knowledge for anyone interested in hardware design, manufacturing, and the intersection of open-source principles with physical product development.