There are several recycling symbols on Thinkiverse already. Unfortunately, I could not get any of them to work well with my OpenSCAD projects. So I made this one as an OpenSCAD library just to make life a little easier.Include this library in your project and call r9abs() to generate the symbol. The default symbol is about 32 x 42 x 2 mm, so it needs to be scaled appropriately for each project.