3D printing is the future of rapid prototyping and small-to-medium-volume manufacturing, as well as on-demand spare parts and fixtures. So what do you do when a part is too large to print in one piece? For rapid prototyping, you can scale it down to a smaller size. For a functional part, however, it is often necessary to split it into two or more parts and then glue them together. The type of split matters on the geometry of the part and the way it will be used. Dovetails, overlaps and tongue and grooves are just some of the more popular techniques used by designers.