About this 3D model

Four of the objects of constant width; a revolved Reuleaux triangle, pentagon, heptagon and a Spheroform with tetrahedral symmetry. When placed under a book and rolled they will keep the book at the same height, and each object will only have two points of contact like a sphere. I printed each shape in two halfs and glued them together with a peg, but I have also included the complete shapes in the STL files. STL 3-is the revolved Reuleaux triangle STL 5-is the revolved Reuleaux pentagon STL 7-is the revolved Reuleaux heptagon STL Spheroform-is the Spheroform with tetrahedral symmetry Checkout some of the youtube videos people have made about them: https://www.youtube.com/watch?v=cUCSSJwO3GU https://www.youtube.com/watch?v=fOojOfpcPZM&t=28s Infomation about the Spheroform with tetrahedral symmetry: http://www.xtalgrafix.com/Spheroform2.htm These are not my idea, but I just wanted to have a go at modeling and printing them for myself. Hope you enjoy them as much as I do!