This is a printable S-Hook. It is very similar to "http://www.thingiverse.com/thing:7769" except you define the inside radius of the hook openings.Printing is very simple. Just lay the S Hook flat on the platform and it should build without any problems.These are the parameters you can adjust:top_hook_radius: [Mili Meters] This is the inner radius of the top S Hook top_hook_radius = 33.5;bottom_hook_radius: [Mili Meters] This is the inner radius of the bottom S Hook bottom_hook_radius = 7.7;width: [mili meters] This is the size of the S Hook body (in X&Y directions) width = 10.0;thickness: [Milli Meters] This is the thickness of the S Hook (in Z direction) thickness = 60.0;start_angle: [DEGREES] This adjusts where the opening in the S Hook starts start_angle = -10;end_angle: [DEGREES] This adjusts where the opening of the S Hook ends.Normally end_angle will be ~-90 degrees. This is so the transition from top to bottom hook is smooth. If you want the opening to be somewhere else than adjust this value. end_angle = -89;