Impractical 3D gears model for robotics

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The discussed 3D gears model features a versatile active ball joint that could serve as a shoulder joint for robots, showcasing innovative engineering. However, some users find the design impractical, noting that the ball spins without a direct connection to other components. The proposed solution involves attaching a shaft to the ball while restricting motion to prevent gear contact. This configuration would allow for two limited degrees of freedom, plus an additional degree for the shaft's rotation. Overall, the design represents a significant advancement in robotics, despite concerns about its practicality.
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https://newatlas.com/technology/abenics-versatile-active-ball-joint-gear/

They say this could be used as a shoulder joint for robots. Mind boggling! I'm amazed this has been done in real life.

The model they show seems impractical to me. The ball spins in place but doesn't connect to anything. I guess what they would do would be attach a shaft to that ball, then restrict the motion so the drive gears don't contact the shaft. The ball would have two limited degrees of freedom then a third for the shaft spinning. Very slick.
 
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