This is the papercraft project. I use Rhino software to draw a 3D image of the objects with the ExtrudeCurve, Loft, Cap, and PlanarCurve. 
 I find it very interesting when I use Rhino to create the objects because after I create them, I can unfold them and make them flat and 2D so that I can print them out the do a papercraft. There is one thing that I find it very hard to do is some of my objects have curve surface, so when I unfold them, don't know how to make them flat so that I can printing them out. There may be a tool to help me do that and I should explore more about Rhino.