Master Piece Beast wars Dinobot calf articulaction piece. When I received my KO dinobot this piece was broken and glueing it back together it still didnt feel like it was solid and would hold up under multiple transformations. This was my fix and can fix yours too. I have only tested it in fdm and not in resin. The file comes set in position for the left leg and would need mirrored in your slicer to be used for the right leg.