Easy to print Fat Cat

This is a slight model change of Fat Cat thing 901128 that I used for printing. It solved slicing issues I had with Simplify and prints well without support.

The changes from the original thing 901128

1. Removed the base plate. I like the cat to be 'free'.
2. Run though netfabb stl fixer. This eliminate severe stl issues that confuses Simplify3D slicer
3. Flatten the bases of the feet, belly and head for easier printing.
4. Scaled up for a size I like (you can still scale up or down t