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While designing parts that should be mounted on my MendelMax 3 printer I needed a model of the V-Slot aluminium extrusions. So I took the section view from OpenBuilds and build this models of a 20x20mm, a 40x20mm and a 60x20mm extrusion in Fusion 360 Ultimate. While the Fusion 360 model serves as geometrical guide, the STL comes handy when I need a short extrusion prototype printed for assembly trials. I print this extrusion standing upright and scale it on the z axis to fit my needs.