Feed the MakerBot PLA Filament through the filament guide tube.
Go to the LCD panel and select Utilities > Change Filament > Load. The MakerBot Replicator 2 will start to heat your extruder.
When the extruder is heated, the LCD panel will prompt you to load the filament into the extruder. Click through the message until your MakerBot Replicator 2 asks you to press the M when you see plastic extruding.
If your extruder has a lever arm at the side, push it down and hold it in place. If you have an extruder without an arm at the side, continue to the next step.
Insert the free end of the filament into the hole in the top of the extruder.
Push the filament down until you feel the motor pulling it in. Wait until you see plastic start to emerge from the extruder nozzle. If your extruder has an extruder arm, release it.
Watch to make sure plastic is still extruding from the nozzle. Then press the M button to stop extrusion.
Push the guide tube back into the opening on the top of the extruder.
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