I happen to be in the industry and we are currently working on the 4D printer.  The 3D printer can only send plans over the 3G network and Apple's new iPhone 5 does not support 3G anymore.  They are using 4G, thus making the 3D printer obsolete.  Besides, transmitting 4D plans over a 4G network is much faster and all you have to do is start with a 3D printer and add one more D.  The early adopters of 3D printers were fooled into thinking that those machines are not version one (i.e., first generation) but they are; which is why people should wait for the 4D models being released late in the 4th quarter.