Headcrab from the original Half-Life
thingiverse
The original Headcrab from Half-Life was given to me by a friend. I discovered that this model - http://thefree3dmodels.com/stuff/characters/headcrab_classic/14-1-0-844, is the one he shared. To enhance my cat's intelligence without making him more destructive (as cats are immune to headcrabs), I scaled and modified it in Rhino3d 4.0. After conversion to STL, it can print well on a Cupcake without support, using glow-in-the-dark ABS.
Download Model from thingiverse
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