The Voxel8 3D printer (http://www.voxel8.co/) can print cavities to place electronics and components and print conductive material to connect them.  The video from CES will give you an idea of what they can do.  They print a quadcopter frame, pausing to have the controller board, motors, LED inserted in, and print the conductive material to connect them together.  Pretty amazing that it is only $9,000.

http://www.geek.com/chips/voxel8-3d-printer-can-print-a-complete-quadcopter-including-the-electronics-1613166/