3D Bioprinting new blood vessels or even organs may be possible in the future. A first step has been taken with the first commercial bioprinter, by Organovo. It currently prints cell structures but nobody has dared to put them in their bodies yet. So while this looks like a promising development, I'd take good care of your body just a little longer - say, 30 years or so?
If I had one of these I think I'd use it to print a brain.
A back-up brain... a smaller one (it's amazing what they can do these days, and apparently I only use about 10% of my brain anway)... a smaller one, but one that's still hosted in my own body - with some sort of wire connecting them so I'm actually thinking with both of them at the same time.
That would be cool. Then I'd separate them so my consciousness was actually residing in two different places, and then I'd put one in the fridge as a backup in case I ever damaged the other one, or wore out it out etc.