Note also the more general concept of "Design for Manufacturing" - tailoring your design to use the strengths and avoid the weaknesses and maximize efficiency in your particular manufacturing process, whatever it is.
3D printing was once conceptualized as a magic way to create absolutely anything. It turns out to be just one more tool in the manufacturing toolbox, bringing some very unique strengths and weaknesses, but still just another of many. DFM applies to 3D printing just as much as it applies to CNC milling, sheet metal stamping, plastic injection molding, or any other process - it's always important to think about how the end product is physically created, and optimize for that.