You break'em, U lose'em.This was an exersice in programming I did. Just some basic curtain rings with octagonal cross section: these should be easy to print and still look nice and symetrical.Enjoy.Print as many as U need.Some assembly might be requiered.(Stl's were repaired with netfabb Studio Basic 4.9, Thanx)In the zip-file you'll find all files for easier downloading.