The £200k ($330k) Objet500 Connex3 Color Mutli-material 3D Printer from Stratasys mixes cyan, magenta and yellow (like traditional 2D printers) to ‘infinitely’ colour base materials of rubber and plastic.
Minneapolis-based Stratasys bought Israeli multi-material specialist Objet in April 2012; last year it bought MakerBot, the consumer 3D printing company
BBC News – Stratasys launches multi-material colour 3D printer.