I just launched a company and our first product is exactly what you described: http://www.voxel8.co http://www.voxel8.co We don't have the resolution to get w

I just launched a company and our first product is exactly what you described: http://www.voxel8.co http://www.voxel8.co We don't have the resolution to get what most board houses can do, but we can reliably hit pitches (pin to pin spacing) of 800 microns. This allows us to build fully embedded fully 3d circuits using many of the surface mount chips on the market today. As we make our machine more accurate we will eventually be able to hit 500 micron pitch and then we will be able to integrate BGA packages. We'll be there soon!