A lampshade I made with openscad, in the context of the last project of my 3D printing course. The printing left some threads inside of it, as the pillars' lengths are very thin. I didn't removed them as they didn't bother that much, however they can be cut off. Took approximately 15h to print, from a ~74MB .stl file. You can also download the .scad file, edit the code and compile it into a new .stl.