A Maker is a modern-day tinkerer and hands-on builder of DIY artifacts. Makers create their inventions wholly out of their imaginations, with the support of a rich collaborative online and in-person community. This paper describes the results from a qualitative study of adult Makers and their characteristics of collaboration in the Maker community. Results indicate that Makers exhibit a mindset of Additive Innovation. This describes the open community of sharing and learning that is the Maker community. Connections between engineering and Making are also discussed.