I am a freelance engineer that specializes in 3D prints. I create technical drawings, construct objects in CAD, provide rendering as well as prints. A client once needed a spare part for a specialized tool. I spoke with him for an hour about what he needed, and then told him what I would charge for designing and printing this piece.
Client: What? Are you serious? I am not paying that amount of money for a piece of plastic!
Me: Well, I can’t just print it from nothing. I need to design it, and I need to determine that the piece will meet your requirements in terms of strength and tolerance. That’s why we’ve been talking about what you need for over an hour.
Client: Look, I can buy this part off the shelf for thirty bucks. I just thought it would be cheaper to have you whip it up.
I was speechless.