Camarasaurus lentus, dating to the Late Jurassic epoch, between 155 and 145 million years ago.
Citations:
Button DJ, Rayfield EJ, Barrett PM (2014) Cranial biomechanics underpins high sauropod diversity in resource-poor environments. Proceedings of the Royal Society B 281(1795): 20142114. http://dx.doi.org/10.1098/rspb.2014.2114.
Thanks to Button DJ and to dryad.org(http://datadryad.org/) for sharing files.
3D printing model:
https://www.youtube.com/watch?v=dfUuNuODyps