I am using 2 extruders. Is it possible to use them both at the same time. Now I can use one at a time but not both at the same time. Is there a gcode that supports this action?
To print with 2 extruders simultaneously you need a firmware that supports that. Luckily, there is a firmware called Sailfish that is able to do that. The feature you are looking for is called
Sailfish firmware is found here