I don't do 3D printing. I barely type. But I carve lures out of PVC, so I have some experience with trying to achieve a particular action.
My rule of thumb is rounder lures have roll, flatter sided lures don't. Something to do with how the shape affects the water as it flows past (thank you Dave). If I were you, like Wayne said, I would make some wood mockups of different cross sectioned lures that were otherwise similar in size, length, lip, and attitude in the water, and begin to experiment until I got a shape that acts the way I want it to, and then do my 3D printing based on that lure.