Despite the depiction of the private collective innovation model as combining the best of oth- worlds (von Hippel and von Krogh 2003), the act of freely revealing intellectual property as a public good is seldom sufficient to sustain continuous contribution. This paper aims to reconceptualize private-collective innovation as the creation and replenishment of common-pool resources, which are subject to the subtractability of resources, and that can lead to problems in collective action. This paper puts private-collective innovation in the context of open hardware entrepreneurship to explore the cyclical relationship between subtraction and contribution among different actors in an online design community. By doing so, we explore the dynamic interplay between private and public interests, specifically the significance of entrepreneurship in open hardware business models of the maker movement and the 3D printing industry.