Since 1974 240 owners have settled for total crap generic aftermarket crap cup holders that look bad and function even worse. A door panel mounted cup holder? Ever try closing the door with a full drink in the a door mounted cup holder? A vent mounted cup holder = a vent deleting cup holder. Come on.
Before you read any further go here: http://www.thingiverse.com/thing:91442
Write the guy a thank you note for designing an outstanding, sturdy, functional and great looking 3D printable 240 cup holder ... and freely sharing it with the world.

My son printed two for me on an old (relatively) 3D printer with not-great resolution but it still came out fantastic. Take a look:

















