PiggyBank

Print this PiggyBank; use it to raise funds for your next MakerBot.
Source .blend file included as well for further exploration (includes non-subsurfaced and non-booleaned original mesh and each derivative step).
I haven't designed a cap that will fit the bottom hole yet because I don't have easy access to a makerbot... soon though. A cork may also work depending on the size you print out.

P.S. I loosely followed this tutorial but used Blender instead:
http://www.oktutorials.com/3d-studio-max-tutorials/modeling/smooth-piggy-bank-p1