Innovation Idea, Small Cheap Precise 3D Printer
Make 3D fabricators from old floppy drives, CDROM drives DVD drives.
Use radial coordinates to convert the points of your 3D print to locations on the platter.
All the circuitry, software, and hardware is there for moving the print head and turning on the print nozzle. Only need to add mechanism for vertical motion. Raising and lowering the platter on the spindle would be easiest.