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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.