I agree with warrplayer, headless design would balance better, they should have used a little more thought at the design stage.
<start rant>
Got to say, I'm tired of all these attempts to make 3D printing seem like the second coming. The only places I see it actually being useful is physical shape prototyping (for testing fit and proportion, etc), medical use (one-off custom components designed per patient where the material choices don't suit CNC), and where the material itself cannot be formed by other means. Even then, a lot of these cases will be better served by CNC, depending on cost (for instance, a prosthetic attachment can have a number of prototypes 3D printed to test the fit and then once it is decided, the actual device is CNC machined). All other cases are better served by CNC, since the material strength is not compromised, you have a greater choice of materials and the precision is orders of magnitude better.
Apparently one thing 3D printing is really good for, though, is generating hype. Nobody really cares about a CNC machined bass, but an impractical, unbalanced, instrument made of inappropriate materials is suddenly "cool" because it was 3D printed.
And it's mostly becuase it's become affordable to have your own 3D printer. 3D printing itself is as old as the hills, there were laser-hardened resin printers in the 80's. They didn't make any world-changing items from the technology then and I don't foresee anyone doing it now, either. The only real benefit of a printer at home is printing simple shapes from shared designs for parts that don't need strength. Small convenience gained over having to order online.
</end rant>