I have several large projects on the go, bulk quantities of the wedding invites and the photo frames. While those parts were cutting I needed something else to work on. My 15 great circle model was inspired by a challenge on the Make blog. When the model got featured on the blog, the new article issued an additional challenge to make the 25 and 31 intersection model, so I duly stepped up and I present to you the 31 circle model.
Made from card stock and 180 separate pieces, this model follows a similar construction to the last one. I used Cinema 4D (yes I know it's an animation package) to subdivide the basic 'buckyball' (football) shape. Then I subdivided each face to get the right number of intersections. This gives me the angles for each of the parts, pepakura unwrapped the model, and inkscape turned it into a sphere for me. Each edge has exactly two thicknesses of card to keep it looking uniform. More photos of the parts and construction technique are included below. (svg here)
4 items /4 weeks