Ekobots - Magdeburg Hemisphers

This is an illustration model of Magdeburg Hemispheres.
"The Magdeburg hemispheres are a pair of large copper hemispheres, with mating rims. They were used to demonstrate the power of atmospheric pressure by Otto von Guericke, in 1656."
This is a model of the original perserved in the Deutsches Museum in Munich.

Caution this model is very dangerous for children under 8 years, see intructions

this text above are a extract of the Wikipedia:
wiki article: Magdeburg hemispheres

News
Version: V1.001 - 5/02/2015 - Corrected printing position on the axis Z of the isolated pieces. Versions V1_001. uploaded.

source of data: Wiki, photos, schematics, and other colected data.
Mostly:
Wiki: http://en.wikipedia.org/wiki/Magdeburg_hemispheres
Commons: http://commons.wikimedia.org/wiki/File:Magedurger_Halbkugeln_Luftpumpe_Deutsches_Museum.jpg