3D-printed revolving devices can sense how they are moving :

MIT researchers created a system that enables makers to incorporate sensors directly into rotational mechanisms with only one pass in a 3D printer. This gives rotational mechanisms like gearboxes the ability to sense their angular position, rotation speed, and direction of rotation.

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Michael Wessely , Marwa Alalawi , Stefanie Mueller , Artificial Intelligence Laboratory , Aarhus University , Electrical Engineering , Computer Science , Mechanical Engineering , Human Factors , Mechsense , 3d Printing , Additive Manufacturing , Capacitive Sensing , Otational Mechanisms ,