Icosahedron with Pyramids Paper Model
This is the “X2” version of the dome, with 15 Connector Hubs and 45 struts added. Instead of the flat faces, short pyramids are made. Result is an icosahedron covered with pyramids and a strong triangled structure. The smaller triangles are easier to cover than large icosahedron triangles. Pyramid height is adjustable. The “Rhombic Triacontahedron” can be made with this system.