Turbines in such an application haven't really been developed, and closed cycle/combined cycle are certainly feasible in the %60 range. I don't see why not. It took 50 years for the piston to get hemi. Though 3d printers are still in the 9-pin dot-matrix phase, I wouldn't be surprised if printing ceramic blades became a thing either. Dude just printed a cement castle:
Concrete 3D Printer Used To Build Castle...in Minnesota - Geek