Once you are comfortable with basics of Open Source Hardware (OSH) and Product Development Process for OSH, you can start working on your Do It Yourself (DIY) type of projects. However, after some time you have to upgrade yourselves from just doing DIY type of projects to some complex projects. This book has a case study on a project for social issue. It also captures some advanced topics in OSH like micro controller boards, 3D printers, schematics etc. Discussions around 'Why Open Source' is also included, so that product developers can analyze what approach needs to be taken before they get into new products. Make sure you read the first book in this series 'Product Development Process for Open Source Hardware' before you take up this book as it will help you understand basics of OSH and Product Development Process for OSH.