Cultures of making-that is, social practices of hacking, DIY, tinkering, repair, and craft-continue to rise in prominence, and design researchers have taken note, because of their implications for sustainability, democratization, and alternative models of innovation, design, participation, and education. We contribute to this agenda by exploring our findings on self-made tools, which we encountered in a 9- month ethnographic study of a hackerspace. Self-made tools embody issues raised in two discourses that are of interest in design research on making: Tools and adhocism. In this paper, we explore ways that tools and adhocism interface with each other, using our findings as a material to think with. We find that this juxtaposition of concepts helps explain a highly generative creative practice-toolmaking- within the hackerspace we studied.