It's a robot desk calendar! You turn the wheels to change the date, which is cool enough on it's own, but there's also a drawer in the bottom to store little doodads.
The image above is of the one I just finished making, which I printed out at 6 inches due to my limited desk space. If you print it out to fill the entire sheet of paper, though, you'll actually be able to fit things in that drawer.
Here's the link to where you can download the pattern:
You'll notice that the instructions are in German, as are the day and month reels. Not to worry if you can't read German; this project is plenty easy to figure out from the pictures provided. I've made a revamped version of the reels in English, if you'd prefer to use those, instead:
|Click to embiggen!|