Rotational screw-on caps are not Cartesian, and this excels at dealing with them.
replyI'm very impressed with this.
Re: chopsticks, oh but it can! It can roll one chopstick between one pair of grippers. Do that while holding the tip against a fixed object and you'll tilt the chopstick. Once you get the tips touching, it can use them.
The motors are inside those chonky things just outside the fingertips. I'm guessing hobby servos, which are tiny cheap and strong.
Still there are fundamental limitations. Holding a bowl full of liquid, a heavy jug with a rounded handle etc.
replyWhat would be the problem with a bowl of liquid?
replyThe balancing there comes from the wrist joint, not the fingers. Obviously this device is supposed to be mounted on a wrist joint that can rotate (pitch+yaw). Wrist joints are pretty well-understood these days.
Rounded handle I don't see the problem unless the hole is too small for one of the fingers.
Holding a rounded handle with a rectangular profile slider is inherently unstable as it's extremely sensitive to the pinch point.
replyAnd the bowl has a radius that make orthogonal grip impractical.