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LOUISVILLE, Ky. (AP) - It may sound far-fetched, but scientists at the University of Louisville are attempting to build a human heart with a 3-D printer.

Ultimately, the goal is to create a new heart for a patient with their own cells that could be transplanted. It is an ambitious project to make a heart and maybe even more so to get it to work in a patient.

It could be years - perhaps decades - before a 3-D printed heart would ever be put in a person.

But the technology is not all that futuristic: Researchers have used 3-D printers to make splints, valves and even a human ear.

Stuart Williams, a cell biologist leading the project, believes the biggest challenge is getting the cells to work together like a normal heart.

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