Invention of the day: A steam engine made of paper.

Everything will work on this engine, the flywheel turns, there really is a slide valve in the valve chest, the piston works, the cranks and the connecting rods, eccentric and strap all work if built carefully. This is the first version available. I am hoping that if you download it and build it, you will give me feedback, and help me to inprove the buildability, and correct any errors in the model. The final model stands about 12 inches high. I hope you have as much fun building it as I had designing it.

(Via Boing Boing.)