I have ordered a few magnets on ebay to make a try, but my main design would remain for now with the motor (stepper or BLDC, whatever I manage to get running properly). But I would be curious to see how they deal with the roll axis, since from the pictures on the website I don’t understand if they are moving also the roll axis motor together with the yoke shaft or if they transmit the rotation in some other way.
What I would like to try (just for fun, at this stage) is a sort of linear rail using that principle, with a stepper driving directly the roll axis moving on a platform. So something like this
Just another idea. One of the many 