The learning curve for CAD software is much higher than the learning curve for 3D printing, so I think for the time being there is a market for people selling their CAD designs. I've never sold any personally; I would rather sell them a finished piece.

I consider my jewelrymaking to be a somewhat artistic endeavor, but I've never claimed to have any artistic ability. As long as my customers are happy, I'm happy. Although I do have an idea for a dead shark in formaldehyde pendant...or maybe an orca whale jumping out of a toilet ring. Could be something.