3D printing in color has been around longer than you think. Do you need a prototype printed in yellow ABS? No problem, load a yellow spool of filament in your 3D printer and voilà! You have yourself a yellow part. How about blue? We have you covered, just toss some blue photopolymer in your SLA vat and BAM! A blue part can be printed. How about a part with multiple colors? No problem. Break out the trusty sandpaper and good old-fashion elbow grease, maybe some primer, then either spray or hand paint your model until your heart is content.
Oh… you were hoping to have full color printed parts straight off the printer? Why didn’t you say so? Let me introduce you to Stratasys PolyJet technology.