They have to find a way or they won't be able to make retarded profits.
All things being equal, a manufacturing plant in the US would generally make somwhere in the range of 1%-5% profit. That should be good enough for anyone, but it's not for the greedy fucks at the top of the ladder.
So you start working towards busting unions, cutting benfits, replacing pensions with 401ks, etc. But that's still not good enough.
So you outsource to impoverished companies. People work for compartively nothing, regulations are easier, and you pay less taxes. You sell the shit back to people in the first world (who incidently are no longer performing actual productive labor, but "managing capital" or just selling the shit to each other). You make a better profit. But it's still not good enough. You're making a ton of garbage for next to nothing, but you still run into the limit of how much people can buy (there's still a limit no matter how debt leveraged we).
So if you want to increase profits, you're left with either (1) paying the people you're exploiting more so they can afford to buy the products they're making or (2) figuring out how to make things still even cheaper. And 3D printers, while cool, produce a product that is cheaper and shittier than what you get from traditional machining. So if you can figure out how to make them cheaper and how to make them such that uneducated, unskilled labor can operate them, there's potential for extra profit. It's like paying somebody 50 cents a day for injection molding vs. 50 cents a day for machining - same price for the labor, but the process & materials in injection molding is way cheaper.
And no one is interested in option 1, really. Sometimes it's forced upon them, but most captains of industry aren't clamoring to make that a reality.