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Researchers at the University of Minnesota, have developed stretchable electronic sensory devices that were originally produced by a 3D printer. These devices, which (as shown in the video) are no more than a few millimeters in length, are significant because they’re capable of giving robots the ability to feel their environment, and are considered a huge step forward toward printing electronics on real human skin. The video is sped up 5X, and while it isn’t necessarily the longest video I’ve featured, this clip does show how a 3D printer develops these devices on a step-by-step basis, even to the point of breaking down what percentage of each substance goes into making these devices.

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