Researchers were able to build the printer with off-the-shelf commodity parts for $7K.MIT researchers, using off-the-shelf components, have built a 3D printer capable of building with 10 photopolymer materials at once. And the school's Computer Science and Artificial Intelligence Laboratory (CSAIL) said the researchers were able to build the printer for less than $7,000. That compares to systems that print with just three materials at one time and can cost $250,000. The MultiFab 3D printer works by mixing together microscopic droplets of photopolymers that are then extruded through inkjet printheads similar to those in office printers. The printing process is...