The Thunderjaw from Horizon Zero Dawn inspired from a preproduction concept made by Miguel Angel Martinez, concept artist at Guerrilla Games. Model made on CATIA V5 for 3D printing.
Miguel Angel Martinez ArtStation page: https://www.artstation.com/artist/miguelmartinez
Model ArtStation page (rendering and 3D printing visuals): https://www.artstation.com/artwork/1GWao