Downloaded the model from the Sketchup Warehouse and it printed nicely.
I printed this with the Replicator 2 using silver PLA I ordered from Amazon. The original model was taken from the Trimble 3D Warehouse and was itelf a remade model of a skull that appears to have been heavily resampled.
I sliced it with Miracle Grue using defaults except for raft, supports, 0.20 layer height, extruder temp at 260C. It took me 9.5 hours to print and about 2 hours to remove the support material. I gave it to my friend Ann for her birthday.
I kinda liked it with the supports; it reminded me of something by H.R. Giger.