It sounds like you're only lacking about an inch and a quarter. Is it possible to position the part diagonally in the printer's work area so that it fits? Remember you've got 3 dimensions to work in, so it can go corner-to-corner, and tilt in the vertical axis as well. Unlike a mill, a printer really doesn't care if the part's in there squarely. That seems better than breaking your part into pieces and having to reassemble it, although that's possible, of course.