While designing parts that should be mounted on my MendelMax 3 printer I needed a model of the V-Slot aluminum extrusions. So I took the section view from OpenBuilds and built this model of a 20x20mm, a 40x20mm and a 60x20mm extrusion in Fusion 360 Ultimate. While the Fusion 360 model serves as a geometrical guide, the STL comes handy when I need a small extrusion prototype printed for assembly trials. I print this extrusion standing upright and scale it on the z-axis to fit my needs.
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Orient it standing upright on your print bed. This gives me the best results relating to the accuracy.
Scale it on the up-axis (z-axis) to the length you need. The original STL model is 100mm (10cm) long, so a scale factor of 0.1 will result in a 10mm (1cm) extrusion.
I print it with relatively thick layers of 0.25mm and few perimeters. No infill needed.