This essay set out to show, through the case of the RepRap-based, Lego-built 3D printing-milling machine, two points: First, on a theoretical level, that modularity, not only in terms of development process but also of hardware components, can catalyze CBPP’s replication for tangible products enabling social experimentation, learning and innovation. Second, that the synergy of a globally accessible knowledge Commons as well as of the CBPP practices with digital fabrication technologies, which are advancing and becoming more and more accessible, can arguably offer the ability to think globally and produce locally.