Choose your favorite Element and print it out.
No, not the Atom itself, but a bohr-model of the atom anyway.

Feedback requested!

Let me know if you are about to discover some new elements! I gladly extend my script with your new discovered element.Theres a blog post about this thing in the makerbot blog:
makerbot.com/blog/2013/07/23/thingiverse-3d-printing-atoms/
AND another blog post in the adafruit blog:
adafruit.com/blog/2013/07/25/3d-printable-bohr-models-of-every-element-customizable-atom-deluxe-by-roman_hegglin/
AND another blog post here:
32b.it/?p=442

Edit 2013-10-23: The Customizer has some troubles to render the atoms with a lot of electrons. So I pre-rendered the largest elements and uploaded them here.