Explore the differences between open hardware and open software in this conference talk from WeAreDevelopers Conference 2017. Delve into the challenges of hardware development, focusing on the HACKberry open-source 3D-printable bionic arm project. Learn about the balance between digital and manual processes in hardware creation, the importance of customization for individual users, and the impact of open-source principles in the hardware domain. Gain insights into brain-machine interfaces, manufacturing techniques, crowdfunding strategies, and the benefits of open-source development. Discover how to get involved in open-source projects and understand the role of community in knowledge sharing. The talk also covers topics such as phantom pain in amputees and concludes with a Q&A session.