You need:
6 Pieces. You can also connect more but, some of the higher configurations are not symmetric.

Print Settings:
Standard settings. No supports or any special settings needed.

Assembly:
You can just watch this Video: Watch the video
The longer End should be pushed into the middle of another Piece. Then build a Ring and that's it. You can take a look at the pictures for guidance.

Pictures by Coco3D
Cocos Instagram