Fab Labs, fabrication laboratories, are shared workshops where citizens can access digital fabrication equipment to design and make their own objects. They are proliferating rapidly and represent an alternative to mass production and consumption, an ideology whose environmental and social benefits their “makers” like to espouse. A longitudinal ethnographic study in a Fab Lab in a European design school examined the Lab’s ideology building, how ideals were enacted and where compromises were visible. Environmental issues were intertwined with other ideological concerns, but they were rarely promoted in their own right. Engagement with sustainability-oriented makers and stakeholders is recommended.