During the first half of the week I printed out these cube gears that I found on Thingiverse:
It's a fun thing to carry around and show people at school what 3D printers are capable of. Oh, and I entered it into a contest on Reddit for fun! check it out here.
And lastly I printed out... *drum roll*
AIRPLANES!!!! :D I don't know what I didn't think of this in the first place.