Quoted from Aurich:It would be a waste of time, the quality isn't remotely there yet. In addition most people don't have access to a printer than could handle the size of a typical ramp.
I agree with you on quality if you are use extruders but photo resin printers leaps and bounds better. The only bummer is photo resin is expensive and would probably need a hardcoat of some kind. It would require a lot of work though to be better than using a mold.