This document discusses business models for making money from open-source hardware like Arduino. It describes Arduino's open-source electronics platform and value chain from hardware to software to community. It then outlines several business models such as selling kits, commercial products, and consulting that open-source hardware companies use while still protecting their intellectual property and brand. The document concludes by questioning whether open-source is always needed, how much work users will do themselves, and whether making money from open-source hardware is wrong.