3D periodic tables

These models show some properties of chemical elements.

update 2016/08/05
- 1st ionization energy added

update 2016/08/05

On the z-axis are:
- electronegativity
- atomic radius
- density
- year of discovery
- boiling point
- melting point
- abundance in earth surface (logarithmic)

All of them are printable.

Special version for dual colour printers placed here: http://www.thingiverse.com/thing:1539966