3D printing has a wide variety of uses and it can also be put to some unconventional uses. People have tried to make stuff that not only eschews the usual plastic used to make the objects but also makes use of non-traditional and commonly unavailable material to print objects. Scientists have successfully been able to print ears, skin, kidney, blood vessels and bones using 3D printers. Instead on typical plastic, a gel-like substance made of cells is used. For bones, a ceramic powder is used instead. In the future, every patient will have their own matching set of skin for a graft, a bone fragment or an organ. Already, 3D printers are capable of printing prosthetic limbs for people with disabilities. The biggest challenge is the challenge of printing a fully beating human heart that works just as well as a natural one. Bio-engineers at the Cardiovascular Innovation Institute at the University of Louisville have printed a coronary artery some small blood vessels of the heart muscle and are hoping to soon print a functioning heart. Of course, to keep them alive must prove daunting. In the future, we may live in houses that have been 3D printed. A researcher at University of Southern California claims to have designed an enormous 3D printer that is capable of printing a whole house in just a day. This conceptual model uses concrete as its base element in order to replicate computer programs of houses. In order to ensure that the house is compatible with plumbing and electrical apparatuses, it uses a layered fabrication tech called “Contour Craft”. A printed house could have far-reaching implications for low-income housing, disaster recovery applications such as creating models of plastic that can serve as a sample or a prototype of a larger-scale version of itself. NASA has been developing technologies to print wood from the printers using 3D bioprinting technology. The basic theory is that the printer will lay out living cells in a specific manner upon a gel. This gel stimulates the cells to start excreting wood. One application could be that astronauts could bring wood to space without actually having to carry any of it. NASA will have the technology ready by the year-end.