Bunny wire is based on Stanford Bunny. It is completely free and anyone can download and modify.
The "weakness map" is computed using "Worst-case Structural Analysis". See the project webpage below:
http://www.cs.nyu.edu/~qnzhou/projects/StructAys/
Validation:
WSF: Rejected by Shapeways without printing.
FUD: Ears warped and broken during shipping.
Stainless Steel: Successfully printed.