Curtain Ring

My Dear Wife is putting new curtains in one of our bedrooms and ran into trouble with the rings. The double thickness of material is to thick to allow the inserts to be used so I decided to have a go at printing some. They are held together with M3 screws and nuts.

This is what I've come up with...

These things were made with Tinkercad. Edit then online
https://www.tinkercad.com/things/b5BmrOUOvmB
and
https://www.tinkercad.com/things/6T9EuAyvtLG