That old Toybiz Doc Ock (one with the soft goods lab coat) as well as a few 3D printed parts like his belt and the 3 heads. The tentacles are aquarium tubing (both the black and yellow) as well as 3D printed parts for the 'hands?' There is metal wire running through each tentacle.

All the 3D parts were modeled by me, the belt hands? is modeled in Fusion360, while the heads were modeled in nomad sculpt on ipad.