I designed this project with ease of printing in mind. Everything lays flat, and there shouldn't be many shallow angled overhangs.
I don't have access to a 3d printer right now, so the dimensions might be a bit strange, but that's why I made it customizable.
Pretty self explanatory.
1) Insert the long stem into the base.
2) Insert each blade into the center barrel.
3) Slide the barrel onto the long stem.
Sanding or glueing may be required