After printing out a Amulet of Daylight I decided the inside really needed to spin.
So with an old copy of nettfab basic and TinkerCad I modified the original files. Adding a post, holes and cap to keep it in place.
I made a version with the troll_topper attached in case you wanted to print it as one part. (this does require supports) It is a tight fit but the center disk will slip in under the troll_toper and onto the post.
I noticed that with the original version the inside disk would hit the troll_toper teeth if I spun it to fast. So I made a second version with a extra mm of clearance.