Takes a 1.5" lapel button and converts it into a ring.
Print. Clip on button. STL file is for a finger approximately 19mm in diameter. OpenSCAD source is available for different sizes. Or you can scale the STL object to fit.
UPDATE: I've added button-ring2 files. These make a more streamlined ring. The new OpenSCAD file has extra parameters for angle (taper) and thickness.
Also added button-ring3 files for "mini" buttons (1")