Not this is through the Printed 3D Device From the paper "We 3D print a cup anemometer as shown in Fig. 2 to measure wind speeds. The entire setup is sufficie

Not this is through the Printed 3D Device From the paper "We 3D print a cup anemometer as shown in Fig. 2 to measure wind speeds. The entire setup is sufficiently light that even wind speeds as low as 2.3 m/s will cause it to spin. The hub of the anemometer is attached to backscatter gear that encodes an alternating sequence of zero one bits. When the hub spins, the backscatter gear pushes against the spring switch. The switch makes contact with the antenna and generates the backscatter signal. Wind speed can be inferred from the rate at which bit transitions occur."