Download and install "CURA" (it's free) load your file then chose mirror. You now have your left hand prop.
I was looking for a prop design for an electric outboard to push a small inflatable fast. I expect carbon fiber nylon will produce a strong enough print for my needs.
Only problem I see is the scan is so good that all the yucky welds n such have been copied, unsure how hard it would be to clean it up.