Therere a LOT of tiny triangles in this STL.  To avoid the support messiness, I halved the brain at a rough 45 deg angle to allow printing on a flat surface. Serendipitously, the two halves will sit flat, resting on the lower aspects of the halved temporal lobes. The initial print was printed 1/2 size, without other modification to the STL and took approximately 21 hours.  I have since halved the model and filled some of the internal sinuses to minimize unnecessary and unseen details. I also know a neurologist who might enjoy a sliced version of this MRI, maybe mounted on some nice oaken stand. Printed with a Lulzbot Taz4, 0.25 mm layers, 10% hex infill. but with all the internal cavities, its very dense.