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Title misleading, they haven't 3d printed a heart, just some arteries. :( We are very, very far away from being able to actually 3d print hearts that could be used.

The same story with a less misleading title yesterday got fewer upvotes: https://news.ycombinator.com/item?id=10442755

(and even the arteries they printed are probably not actually functional)

At best I thought they were scaffold for another step, like covering the printed 'tree' with an elastic coating that would then be an 'artery'.

It's amazing to think we may one day be able to!

So.. what open source software are they using?

How to 3-D print a heart