Inspired by Opteryx's 3 blade spinner, which I use on a few of my planes, I designed this 2 bladed version for use on mini electric RC planes. Though not an actual re-design of their original piece, this one is dimensionally identical and is basically a ground up copy, so credit where credit is due.

Print it nose down with support like the red one in the picture at 100% infill. I had to press the nut in with some channel lock pliers. Once on, you can use the hole through the spinner to screw it tight on your motor.