A DiY approach to knowledge is a free-ranging approach to postdisciplinarity. DiY knowledge contrasts with the knowledge of the ‘specialist’, as one who maintains the territory of the discipline, since it seeks to ‘burst open’ or, less dramatically, to ignore the enclosed territories of the expert. In this chapter, we explore notions of DiY ethos, making and citizenship in order to range freely in a DiY postdisciplinarity and to explore manifestations and contributions of DiY to postdisciplinary knowledge. While the idea of disciplinary and postdisciplinary knowledge is a critical concept in this work, we do not attend specifically to a definition and/or theory of knowledge and its relation to practice. Rather, we explore knowledge, knowledge relationships and practices through observations in a series of DiY projects.