Chain links to be used as bracelets, chains, belts, etc. The outer shape is a barrel type shape (radius 10mm), but it can be easily altered, as long as the male and female connectors stay the same. I tried to create a shape that is more prone to be 3d printed without supports because it turns out the first generation links tend to have a weak male connector, depending on the filament used. CAREFUL: This is the 2nd evolution step of my Ball Heads Links System, the connectors do not match the original links to be found here: http://www.thingiverse.com/de_baseggio/collections/ball-head-links-system.Whether the ball links do actually work or not depends heavily on the material, the slicer and of course the printer used. If it does not fit, simply change the size of the head until you achieve the desired result.