Additive manufacturing is the star of IMTS 2014. Local Motors' 3-D printed car to Stratasys's production part plastic printers all point to one conclusion - 3-D Printing has hit the big time. Take a look at the range of 3-D printing machines on the floor at IMTS on IndustryWeek, a companion site of American Machinist and a part of Penton's Manufacturing and Supply Chain group.