If you're printing this amazing free aircraft model of Eclipson (https://www.eclipson-airplanes.com/g%C3%B61wolf), you'll probably feel sad if, at the very end, you notice that the shaft of your brushless motor is not long enough to complete the build. This was the case for me… I was very very sad…. 

But if this happened to you as well, fear not! Just print this spinner2 instead of the original one. Its thickness has been reduced to the absolute minimum, and you won't notice the difference. Enjoy your maiden flight! Mine lasted 5 glorious seconds :-) I shouldn't fly airplanes