3d printing eh?

So recently I came across 3d Printing:

http:// www . cnn . com/2015/10/06/health/3d-printed-heart-simulated-organs

Is this stuff real?

I guess you upload a file on a printer and it makes it into actual working 'physical' piece.

Apparently they have files for it too now (Like this hip replacement):

https:// pinshape . com/items/12527-3d-printed-hip-bone-segment-mri"]https:// pinshape . com/items/12527-3d-printed-hip-bone-segment-mri

Is this stuff really real? 

Thanks!