This is a simple model of completely customizable atom (mine it's a sodium one). 

In the file “Atom” there are not all the special settings, so it's recommended to print from the other ones.

I recommend to print the rings and the supports with PET-G Translucent to have a transparent effect.

The spheres have a little support that can be removed easily

It's possible to resize all the elements for the atom that you have to build!

Assembly:

1. Glue the number of spheres that you want together to create the nucleus
2. Glue the number of spheres that you want on the rings (as for the spheres you can decide the number)
3. Glue carefully the supports on the back of the rings as in the picture

    5. If you want you can tie everything with a fishing line (as mine)