This is a propeller that I designed. It prints out fairly well, but does need supports. This is also a functional propeller, and if you were to get it spinning fast enough might fly. I couldn't get it fast enough just with my hands, but using a drill and a release mechanism you could probably get this thing to fly up.
Flashforge Creator (Dual)
I used 0.1mm just because the propellers are fairly thin parts and the high resolution helps them to print much better. I would also recommend printing this in ABS as this needs to be a durable part.