Bracket for hanging Christmas star on window shutters

To hang a Christmas star light in front of the window. I didn't have a place to hang it. Instead of drilling a hole in the ceiling, I realised I can hang it from the window shutters. 

The model is intended to snap onto the top rail of your shutters, alternatively you can remove the shutters first and slide it on from the side, then place it back into the brackets.

The model was made in OpenSCAD and is fully parametric, so you can enter the dimensions you need to make it shorter/longer, lower/higher, thinner/thicker, narrow/wider, etc. The downloadable STL was generated for a 56x38mm top rail, which is rather chunky.