The logo is indeed "true" 3D:

Granted though, the details (like slightly rounded corners or surface scratches) are all faked via shaders, and especially the rock base is mostly a texture map. Also the perspective on the rock base is totally faked (by skewing and tapering it) to match the one in the original. After all, the lettering on the original logo is seen full frontal (or at least I treated it as such, to trace the letters), while the rock base shows a clear perspective, as if the logo is looked at from below.

So ultimately the rock base wouldn't really work as a 3D print. But I guess it can be much more
easily chiseled out of some styrodur or foamcore, painted to look like proper rock, with the 3D printed letters glued on top (or slightly pushed into the material). What kind of 3D printer do you have? Or do you just use services like Shapeways?