A keychain representing the logo of I3Lab, the laboratory in which I'm studying to get PhD degree.

History: I were in the middle of my PhD program, when I've got my first 3D printer, a Creality Ender 3. Last time I've used a 3D cad, Blender, was 2009, hence I needed a simple object to refresh my (unpretentious) knowledge about 3D modelling. During this period, I've designed 4 versions increasingly nice and sophisticated accordingly to my improving skill about 3D-printing. Finally I've reached the version 4, IMHO the definitive one: minimalist, double-face, with a nearly invisible base. It seems fragile, but I've tried to bend and it can resist to pressure due to bags and jeans pockets.