About this 3D model

Small project to create a mold which can create ice-rubber-ducks. Would be fun to have those floating right up in your cola or other brew. Update2 - Just printed the mold, now need to tweak te top a bit, and the idea is now to fill it with "Vanille vla" for desert creation!. Update1 - Duck wont float upright.. i ran a simulation and the following link is showing the result. http://www.youtube.com/watch?v=W4zJ3WcrWAU&feature=youtu.be