Sometimes you need an S hook. Sometimes you need an S hook that is a very specific size. Sometimes you need an S hook that has a specific opening. Sometimes you need such specific S hooks that you spend the time to write a scad script to generate S hooks for you. Sometimes it is too early in the morning and you haven't had coffee yet and you keep writing formulaic sentences about S hooks instead of writing the code that your boss wants you to. Sometimes.

Update: WilliamAAdams simplified the scad script and made it possible to have the hook opening > 180 degrees. The s_hook1.2.scad contains his work. Thanks William!

The script is very parametric and vaguely commented. You can set the radius and opening of both ends, as well as the width and thickness of the bar. If you set the opening value to 0 it will be a closed loop instead.