On the other hand, millions of American's are impacted by illegal immigration. From honest business owners who compete with businesses that hire illegal labor, to underfunded schools and social services, and of course the victims of crimes committed by the undocumented -- from hit and run, drunk driving accidents, to rape and strong armed robbery and petty thievery.
We have laws on the books that were not here when my ancestors came to America. America still has more legal immigration than all other countries combined.
A country without laws, borders, or a common language is doomed to fail.
2. The software to create and modify 3D objects has a learning curve (requires time and effort to learn.)
Sure its fun to create little plastic toys, chains, balls, and cases.. Interesting, but not particularly money-making. A nice skill to have, perhaps. But owning the printer isn't required to learn the skill or take part in the revolution. Save your cash and send your designs to a 3D print shop. Disclosure: I have a very cool but underutilized Makerbot I rented for the summer.