(EHSM) will feature presentations of the brightest DIY achievements. But we do not want to stop at DIY. In fact, we should not, because teamwork is the only way to get the big things done. The open source ethos is about keeping the freedom and openness of DIY when many people are involved. At a time when thousands of developers from hundreds of companies contribute to Linux and the world’s largest physics laboratories share openly licensed hardware designs on OHWR, we will explore the cutting-edge open source hardware and software practices. This premiere of the EHSM will be held in Berlin on December 28-30 2012. Everyone is welcome to attend it.