Yesterday Her Majesty Queen Máxima of the Netherlands was there for the opening of the "Smart Bridge" in Amsterdam, which was 3D printed.
Out of metal.
They used computer-programmed welding robots to print the bridge layer by layer until the structure was complete...
Photo from TheMayor.eu... photographer not credited
But it's also frightening, as it means the technology to print with metal is here and will only get more refined and precise in the future. At which time the technology will get cheaper and will make its way into our homes. At which time people can start printing firearms. Something I have been talking about for a decade now.
I don't know what the solution is to stopping gun violence (or any violence, really). But in a fast-approaching era where anybody can print the parts and assemble a fully-automatic weapon in their basement from plans they find on the internet... we'd better figure it out. Education programs. Mental health programs. Empathy programs. Poverty-ending programs. Marginalization-ending programs. Something. Anything. Our governing bodies may want to look into stuff like that before we get to the point where banning guns is a futile gesture that comes too late (as if we're not already there... that genie is out of the bottle).
People who intend harm will always have access to weapons. And their weapon of choice could end up being something terrible that we can't even conceive of right now. That's how fast technology is moving. Staying ahead of it is essential, but current solutions always revolve around escalating the violence. And it's not working.
Evidence of that is all around you every day.