Plenty of companies know 3D printing exists but not where it fits their own work. We look at what you make and where it runs rough, and then say where printing helps and where it does not. That last part matters: sometimes a machined or bought part is simply the better choice, and we will say so.
Prototypes are only part of it. Just as often the gain sits inside your own production: a custom aid, a fixture, a guide, a holder that puts a part in the same place every time. Small pieces of tooling that shorten a step, or that spare your people's backs and wrists.