The key patents covering a 3D printing technique called "laser sintering" are set to expire in the next year or two -- there are a bunch of them, so they'll trickle out -- and this will radically reduce the price of printing and printers. Laser sintering involves melting a fine powder (usually plastic) in order to fuse it with the powder below and around it, and it's a technique that produces a very smooth, even finish. The big 3D printer manufacturers, who control the laser sintering patents, have used patent law to lock up the market for devices, and to prevent device-owners from sourcing their powder from third parties. As a result, simple, cheap plastic powder can cost more than filet mignon by weight, which means that the cost of 3D printed objects is very high -- especially when you factor in the extremely high cost (and high profit margins!) on the printers themselves.
As these patents expire, it will mean that mass-manufactured printers from China and elsewhere will be able to integrate laser-sintering, setting aside the extruded plastic wire technique that is presently standard.