This steam engine model was originally designed by Lutz Hielscher. I bought this model off eBay and then created the CAD model from my own measurements of this model. It is not a 100% accurate and does not contain all parts. I created it for the purpose of creating an educational video on YouTube.
3D CAD drawings for YouTube demonstration video. You will need FreeCAD with Assembly_4_Workbench installed to view CAD files.
This steam engine is featured in this YouTube video.