The Duet Shield PCB adds the capability of driving up to two more extruders for three feed machines. The board has been designed to neatly fit over the Duet and it has horizontal connectors to give it a low profile to keep the electronics as compact as possible. The Shield plugs directly into the Duet.
The RepRap firmware that drives the duet is already configured to drive the shield as well so no changes need to be made to the firmware.
DC power link cables are included to power the shield from the 5v regulator board.