My dad owns a tool and die design/engineering shop, they generally make fairly small, specialized parts for automotive design. When I was young, I went to work with him to see what he does, and noticed a wax model of the project they were working on. He said they model the project by hand to get a good vision of what they were designing (this was before 3D CAD came around). When they were nearing completion, they'd present the wax model to the customer to make sure all the specifications were right. If they were, my dad would complete the design and send it out to the die makers. The die makers loved having a handmade physical model of what they had asked for before they paid for the completed design (which could have had unseen errors).
Fast forward a few years, and my dad acquired a competitor who happened to have a 3D printer. Now my dad's company would make the design, print it out, and show it to the customer. One customer did not like this at all, so much in fact that they sued my dad's company. If the engineers could make these parts themselves, how long until they could make them with metal? How long before the die makers were turned redundant? The die makers have a lot of money invested in very expensive equipment to make these parts, and now 3D printers can make plastic replicas of them much cheaper (though there are obvious downsides in terms of scale and tolerance).
When the company filed suit, they dropped the contract with my dad's firm (which happened to be the die maker's only design shop) and spent all their contingency funds on the suit. The company was bankrupt before it ever saw court. So yeah, this technology has a lot of important industries very concerned.
Here's the gist: I don't know all the legal details because my dad and I are not that close. The company sued for "unfair competition" or whatever the legal term is. Since my dad's shop had the full specs and customer list of the die maker, they were afraid the engineers would cut out the middle man, so to speak. The die maker wanted them to stop building models completely and dispose of the printer.
I can't say if the printer was the only factor, but they never had a problem with the hand-made models.
Fast forward a few years, and my dad acquired a competitor who happened to have a 3D printer. Now my dad's company would make the design, print it out, and show it to the customer. One customer did not like this at all, so much in fact that they sued my dad's company. If the engineers could make these parts themselves, how long until they could make them with metal? How long before the die makers were turned redundant? The die makers have a lot of money invested in very expensive equipment to make these parts, and now 3D printers can make plastic replicas of them much cheaper (though there are obvious downsides in terms of scale and tolerance).
When the company filed suit, they dropped the contract with my dad's firm (which happened to be the die maker's only design shop) and spent all their contingency funds on the suit. The company was bankrupt before it ever saw court. So yeah, this technology has a lot of important industries very concerned.