Here is a huge skull replica.
This model originated from a bigger model of a woolly mammoth skeleton. The original model used as part of the Smithsonian X3D Program and was taken from a 3D scan by the National Museum of Natural History. Create a level plane in the model to ensure a great print and a surface to mount the part to a wall and MeshMixer was used to isolate the skull. This version prints well.
PS: printed at 50% scale.