Rexneto Helm
T-Rex Skull + Magneto Helm = The Rexneto Helm!
Both of the original files come off of thingiverse.
Fits perfectly into a MakerBot Z18. Just about maxes out the build volume.
Magneto Helm: http://www.thingiverse.com/thing:12006
T-Rex Skull: http://www.thingiverse.com/thing:308335
The Magneto Helm wasn't resized at all.