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Every week, it seems, there’s a new breakthrough in 3-D printing that promises us the ability to (eventually) fabricate some new thing in one of those glass-walled wonder boxes. Such things have included everything from spare parts for the International Space Station above to the beef on our dinner plates to the organs inside our bodies. Although this last idea of fabricating body parts may seem the most fanciful, a team of scientists is reporting a breakthrough in 3-D printing using human embryonic stem cells that could purportedly lead to life-like bioengineered tissue and, eventually, artificial organs tailor-made for specific patients.

Researchers have been able to engineer tissue samples in the past by combining artificial scaffold-like structures and animal cells. Depositing human embryonic stem cells in cultures using a 3-D printer offers some advantages. In particular, the cells can be positioned in droplets of uniform size cheaper, faster and more easily than using manual methods. This uniformity is important for researchers trying to generate specific cell types.

Whereas human embryonic stem cells have proved too fragile to print in...