Oscillating twin-cylinder steam/air engine.
This is working toy/model of twin-cylinder oscillating/wobbler steam engine.
I have developed it just for fun.
It's designed in OpenSCAD and almost fully parametric.
The model almost fully plastic only two m3 x 10 allen screws required for connecting two parts of fly wheel.
Edit 6-dec-2014: Slic3r settings screenshorts added.