Quite often, 3D printing is used to produce parts that could just as easily be made using another manufacturing technique. Yet, although the final results might look the same on the outside, what’s inside could be drastically different.
A major benefit (and necessity) of 3D printing is that parts can be varying degrees of hollow. From a production perspective, this reduces material and cost as well as the weight of the final product. And from a printing perspective, it saves valuable time!