Foldable Polyhedra

3D solids aidan compliant compliant mechanism cube dodecahedron filaflex Flex flexible flexible filament Flexure flexure hinge foldable foldy geometry hexahedron hinge icosahedron leitch living hinge math Math project math art Ninjaflex octahedron platonic solid polyhedra polyhedron semiflex shapes tetrahedron topology toy tpe TPU xyzaidan