JimPlatt
https://grabcad.com/library/mobius-pendant-5 and this one aswell!
ready for 3d print. solid model.
Also if you want to model by yourself you can watch Nishant Gautam's videos.Thanks for him to share videoshttps://www.youtube.com/channel/UCsD2zKOCUtw5oVSkx2FOv9Q