Customizable Atom: Choose the number of electrons and it generates you an atom represented in the Bohr model. This is just a simple model of an atom: It just fills the rings with electrons (this is not correct for every element!) For a more Customizable atom with full control over every ring, please visit: http://www.thingiverse.com/thing:113015 Thank you Damrin for pointing it out, that my "simple" atom was not correct for every element! Edit: There is a remix of this Thin with pre-configured Atoms and Text! http://www.thingiverse.com/thing:114247