So you'd have to create a 3D model (CAD) of the case. There are various file formats you can save the file under (i.e. stp, igs, etc) and you upload that to the 3D printer. You'll need to make sure the printer is large enough to print the case, assuming you want it in one single piece. One concern I'd have is the surface finish. The finish won't appear smooth due to the resolution of the printer (perhaps it may depend on printer). But I'm sure some creative post-processing would result in a nice piece. I guess the question would be, do you have ability/software to draft up the case.