The time is coming, more than likely within a few years, where a reliable 3D printing machine, will enable you to drink a soda, wash the empty bottle, and drop that empty bottle into a machine that will make it a more useful object.
Think of how this will change how you buy your stuff. The things you use every day.
At present with this world the industrial revolution has brought us. Man makes very very little of the food he eats, or things he uses every day. Each American worker (and Euro,Japanese etc) is a hyper-specialized worker bee. They work every day to earn fiat money which in turn they trade for their food, energy, and things they use.
Sounds good right? Except that there are parasites in the system. Taxes, fees, duties, all imposed when something is traded for another.
What if we eliminated the middleman? I know we can not do it 100% self reliant, but we surely can up the percentage.
Think about this: If you design something, and make it, and you are the end user, there is no middleman, no transaction to be taxed or tracked, or controlled.
Within a generation, these machines will be making complicated electronics and full copies of themselves. If you take the time to learn now, you will be THAT GUY.
For example, here is a 3D printed CNC machine I designed. It literally is a machine making another machine.
This revolution is not just in the stuff you use.
It is the food you will eat, and even how you live.
More on that later.
Below a few other things that are 3D printed.
Below sound amplifier attachment for Microsoft Surface Tablet
Above, belt buckle. As is straight from the printer without post processing.
Below machine part. 3D printing time 45 min and 20 cents material.
CNC machining time on 5 axis Haas machine is 8 hours and about $200 USD.
This part is extremely difficult to manufacture on a 3 axis manual milling machine. It would take eeks of time to make.