This is the blade of a small Vertical Axis Wind Turbine.
It is designed to be stacked in sets of 2+.
It is a helical Darrieus constant torque design. It is not self starting. The airfoil is a NACA 0015 with zero angle of attack.
Still needs a stand and end cap.
There is a high and low polygon model if you are in to that sort of thing.
Print as many as you dare and snap/glue them together.