>>7839447>In both cases, if you're going for something more like trying to emulate glass or a window, you might be better served making the shape on a 3D printer, then vacuforming a clear plastic shell over it. I haven't tried this yet, but I've seen it done.I agree with this approach to an extent
3D printers are largely for prototyping to begin with, so I think you'd want to treat them as such in this case.
3D print the part, then make a mold for it and cast the finished part in clear resin. You can make your parts as clear as you want them to be that way.