Here is my snowman and scifibox.
I 3d printed the snowman but was not able to 3d print the scifibox, it would not slice properly with any of my slicer programs. Also the scale of the exported stl and obj files from blender seem off, I had to enlarge them 15x. I hope I learn how to create models that can be 3d printed.
There's a couple of courses for 3D printing. Linking up:
https://cgcookie.com/courses/make-it-3d-printing-with-blender
https://cgcookie.com/courses/printlab-your-guide-to-3d-printing-with-blender-and-a-prusa-printer