3D-Printed Mouse

So, I was looking, just for fun, for a mouse in stl or some other useful format and found this:

http://web.media.mit.edu/~mellis/mouse/

Pretty cool. The idea is to be able to print some kind of mouse "add-on" for my device too as well and thought someone already must have done it. And I found the above... Anyway, I will see if I use that design, http://www.thingiverse.com/thing:1056, or something else that may show up...