Please read instruction sheet on the link below before assembly.
https://www.flickr.com/photos/160597604@N06/45891931012/in/dateposted-public/lightbox/
1) Fully articulated
2) Needs 4 "Ø5mm x 20mm" springs to strengthen the ball joints
3) Adhesive is neccessary
5) Prefect for FDM 3D printer