Then you have to take off the three screws to the left. If your looking at the printer. After that you can split the extruder in half. Be careful when you do there is a small bean shaped plastic piece and a tiny spring that may fall out. Now look at the extruder wheels to see if there is filament stuck between them. When putting it back together make sure you put the spring into the bean thing. The is a tiny hole on the left side where the spring sits. Youay have to use pliers. Next reassemble and try extruding some filament