Hi there DiAvisoo,
The sweep rotates continuously to gather data in a 2 dimensional plane. The 3D scanner kit effectively rotates this 2D plane. The plane need only rotate 180 degrees to generate a spherical scan. Physical bump stops prevent the 3D scanner from being able to rotate more than 180 degrees, and each 3D scan is always started from the same home position. Together, these qualities avoid complications with cable winding. For more information, see the section of the 3D scanner Github wiki on Theory of Operation, here.