Full title: “Commons-based peer production and digital fabrication: The case of a RepRap-based, Lego-built 3D printing-milling machine”, co-authored by Vasilis Kostakis & Marios Papachristou. Summary: Through the case of the RepRap-based, Lego-built three-dimensional (3D) printing-milling machine, this paper sets out to discuss and illustrate two points: First, on a theoretical level, that modularity, not only ...