So, it pleased me enormously to see the LEGO Delta Robots via Hack A Day.
A Delta Robot isn't exactly the same as a Canfield joint. The parallelograms formed by the arms force the end effector to have the same orientation as the base on top. In contrast, a Stewart Platform behaves more like a Canfield joint, in that the end effector's orientation can be different than the base.
The beauty of the Canfield joint is that two such joints connected in series can act as either a Delta Robot or a Stewart Platform, with loads evenly distributed no matter what the orientation.
Here are some more videos of commercial Delta Robots in action:
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