Da Vinci Cam Hammer Paper Model

I have always enjoyed functioning models of Leonardo da Vinci inventions. Pictured is a papercraft version of da Vinci's "cam hammer", a labor saving machine for hammering metal. Steam powered machines like this were used hundreds of years after Leonardo's death during the Industrial Revolution. This paper model is the work of my papercrafter friend Giuseppe Civitarese and may be downloaded for free at his website, Paper Pino.

Other da Vinci Papercraft:

Ornithopter (flying machine)
Turtle Tank
BBC Leonardo Foldees