A model of a jet engine I made with OpenSCAD. I installed bearings in the front and rear cones and used an aluminum shaft to mount the blades on, although it doesn't rotate very well because of some alignment issues. I didn't expect it to rotate at all though, so this is a step in the right direction. V2 will have removable blades and they will be held together by laser cut hubs so that misalignment won't be a problem.