This is a prop spinner cone for the Syma X8 series quadcopter, or any other 3mm shaft. Photo is shown next to the original (chrome) spinner cone.
Update: v2 STLs are modified slightly to allow better clearance for the prop clamping mechanism.
Prop_Spinner_Cone_Set_v2.stl | 15.7MB | |
Prop_Spinner_Cone_v2.stl | 5.3MB |