Basic Small DC Motor Fan/Turbine

thingiverse

This motor accommodates any shaft with a diameter of 2 millimeters. A 2.1-millimeter wide hole in the shaft provides sufficient clearance to ensure smooth operation without causing excessive slop. However, the support system leaves much to be desired and still requires refinement for optimal performance. Fortunately, the blade is well-balanced enough to run efficiently at speeds up to approximately 1,000 revolutions per minute.