3D printed body parts including tissues, bones, and organs could soon become an actuality based on the fast progress of scientists reported in a new study.  They have developed a 3D printer that could become a life-saving device that uses live cells to produce living tissue. It helps to bring science fiction to the real world and adds to 3D printer applications that already include toys and models.  

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The printing machine started as a high-tech ink jet printer. However, researchers have developed it into a powerful gadget that could be a game-changer in the medical world.

Scientists have built the Integrated Organ and Printing System (ITOP), according to Engadget. It uses an Earth-friendly plastic-like material and a water-based ink.  

Dr. Anthony Atala works at the Wake Forest Institute for Regenerative Medicine. He told CBS2 that the North Carolina scientists had printed cartilage, muscle, and bones for jaws and skulls.

Researchers learned it was not enough to eject cells from a printer's nozzle. They ran into a few problems. One issue is that it resulted in a mushy mass of cells that would be difficult to implant, and the cells needed to get enough nutrients to stay alive, according to CBS New York.

The scientists had to print very thin micro-channels that created a "highway" to the tissues' center where they could get nutrients.

They used a "bio-ink" gel that was a blend of cells and nutrients. That kept the cells alive until a person's blood vessels and capillaries started to grow into the new tissue.

The cells also made gel that was solid enough to be held and implanted. Scientists have already completed the process in rodents, such as by implanting human-size ears under mice's skin, and skull bone in rats. They are now conducting long-term studies so the tech can be used on human patients.

Flat tissues such as skin are the easiest structures to print; tube-shaped and hollow organs such as blood vessels are more challenging; and the most difficult are organs such as livers, kidneys, and hearts. However, the scientists have already printed some replacement body parts.   

Here's Mattel's 3D printing ThingMaker: