Rhino
thingiverse
I came across a rhino model that lacked substance and wasn't print-ready, so I leveraged the MeshMixer program, which is free to use (http://www.meshmixer.com). With it, I patched up holes in the mesh, gave the overall shape a smooth finish, tweaked various components using a brush tool, and made certain that every single detail was at least 1 mm thick.
Download Model from thingiverse
With this file you will be able to print Rhino with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Rhino.