Had broken one of my fan on the printer decided to remodel it, It's slightly different but it's perfectly balanced, no vibrations or noise. I remove the metal shaft from the broken fan, it fits tightly in the printed prop you may need a small hammer to press in. I recommend adding a bit of grease on the shaft. Magnet fits tightly as well you be able to just press it in. Note i have updated the model a bit it will be slightly different from the picture.