Let’s improve the 3Drag with this new board that allows to control a fan and (thanks to the ATmega2560 processor) add some code and accessory devices such as a display or an SD Card.

Download the modified version of Marlin for this the controller.

http://www.open-electronics.org/a-new-board-for-the-3drag-theres-more-than-sanguinololu/

http://www.reprap.org/wiki/3Drag_controller