This clock was actually a suggestion by a customer of mine, and it was such a GENIUS idea I just had to make it. It was an absolute pain to make, but it was realllly worth it!
I recommend printing it completely before you start assembly, and make sure you sand off any little imperfections in the sides. That'll make it fit together better. You'll also need a clock mechanism, but you can get those cheaply from a variety of outlets (I buy mine from Amazon). Enjoy!