Geodesic domes - even people who don't want to live in one think them beautiful. Who doesn't admire Epcot's architecture? This is another hub to join the struts that form a geodesic dome. This one uses common drinking straws as the struts, and builds a dome about 3/4 meter in diameter. This design's distinctive feature is the hubs' swivel arms. Fixed-angle hubs can only be used in the architecture for which they were designed, but a varying-angle hub like this can be used in different geodesic dome designs.Many geodesic domes are possible, but here's a simple plan: Print - Purchase drinking straws and cut to length - If your straws are not the same diameter as mine (23mm circumference; see photo), you'll need to customize the "straw_inside_dia" parameter in "geodesic joint.scad". Assembly, starting at the top - The axles on each hub have very small footprints, so sometimes one will come loose early in the print and ruin the print. To prevent that, you can use the "w(ith) brim.stl" versions, which have a larger footprint and so are more stable, but are easier to work with than Cura's auto-generated brim. Example geodesic dome calculator: http://www.desertdomes.com/dome2calc.html When using a calculator, keep in mind that the joints printed here add 30 mm to each straw's length.