1. INTRODUCTIONWe have all heard of 3D printing, but have you heard of 4D printing? Probably not. 4D printing uses the same technologies as 3D printing, but with a slight change, objects printed in the fourth dimension have new capabilities. 4D objects will be able to alter their shape or appearance over time. 4D printing allows you to think outside the box, perhaps even producing weapons that can assemble themselves. One of the limitations of 3D printing, in which a printer rolls out successive layers of material such as plastic to create different objects such as guns and toys, is that assembly is often required, but 4D printing offers the ability to create things that come together literally. . navesti izvor i datum pristupa: http://www.livescience.com/40888-army-4d-printing-grant.html2. ABOUT 4D printing offers the possibility of making things that literally come together. The technology could also create objects that last longer than their 3D printed counterparts and adapt to specific conditions on command. 4D printing involves using a 3D printer to print self-healing programmable material. For example, you have a non-living object that can change shape and behavior over time, like a robot but without microprocessors, actually something that looks like plastic. Skylar Tibet, the man who came up with the whole idea, even became fodder; created programmable sheet material. It looks like a plastic that, in combination with water, can change the shape of the cube. And the cube is just the beginning. There will be a million shapes. It could be very useful, not only on Earth but also in orbit. This idea could change the world and live in it. Imagine being able to simply print your own furniture. An...... middle of the card ......externally.3. HOW IT WORKS The idea was to improve the 3D printer with special technology, a single printer, with multi material characteristics, can transform from any 1D wire into 3D shape, 2D surface into 3D shape or transform from one 3D shape to another . The form of 3D technology is the basic mode for 4D. Objet Connex multi-material technology is an important part of his work and is used extensively in this new process. Connex multi-material technology allows researchers to program different material properties into each of the various particles of the designed geometry and takes advantage of the different water absorption properties of the materials to enable the self-assembly process. With water as the activation energy, this technique promises new possibilities for incorporating programmability and simple decision making into non-electronic materials.