According to this news, scientists can use stem cells to print objects. So say theoretically, is there any possibility to print human beings?
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The easiest answer to this question is NO. We will not be able to print humans any time soon, if ever. Despite the potential of the technology, it will likely still make more sense to use stem cells to fight genetic diseases, create limited cellular masses such as hearts and other organs, and to do reconstructive surgeries such as skeletal repairs.
The reasons vary but will include:
It is certain that some things we may do in the future may be done by printing output that resembles cellular matter, i.e. bone repair and restructuring.
The potential for specific cellular development is outstanding but the method for growing complete humans has had millions of years evolution and not likely to be surpassed by Humanity in the next thirty to one hundred years unless we come to a far greater understanding of the human genome and the genetic/cellular relationships between systems in the human body as a collective whole.
The reason is that development is extremely important for getting tissue organized on the appropriate scale. We can place groups of cells or a scaffold somewhere, but we can't assemble a working cell from component bits, much less make one that has one end in one's toe and the other in the spine (as is the case with sensory neurons for our legs).
So 3d printing of tissue is limited to tissues that have very simple or robustly automatic developmental processes. This includes things like skin, liver, and bone; it does not include things like muscle, neurons, joints, or blood vessels.
As technology and knowledge of developmental processes advances, we will be able to print more complex things, but it's not clear to me when or if we'll start running into physical limitations that mean that we basically just have to let things grow and develop the way they normally do.