We will be able to print anything we want and help others although there will be people who would print guns but guns are already available to many of those crazy people there will always be the chance of someone using technology to hurt someone but that doesn't make technology bad. Technology is like a set of keys they can open the gates of hell or the gates of heaven it all matters on who uses it and what they use it for. Fear can keep you alive but it will always keep you from advancing and that is the one thing that humans as a whole cannot afford to do so i am hoping that 3D printing will become as common as a blender or a television.
Another thing is that the positives far outweigh the consequences. if you mix 3D printing with stem cells then you would have a machine that could save millions of lives and is far more faster than waiting for a transplant on a overgrowing list. I'm sure the person who needs a new heart would be in favor of this. Not only that but this is just the first steps to a world of possibility and with technology advancing so fast in such little time we will see things like printable legs and arms very soon.
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