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Next, let's get familiar with the Filament Drive, an integral component of the 3D Printing process. The Filament Drive can be seen in the first image.

Verify the spring has not cocked to one side and is straight as shown by the blue arrow in the second image.

Push up on the Filament Drive Lever (shown by the pink arrow in the first image) to widen the gap between the Filament Gear and Filament Bearing (green arrow) . Then insert a piece of paper in that gap. Release the lever and verify that the paper is held in place by the gear and bearing, and that the paper does not fall out. Then remove the paper.

[You should not need to follow this step unless you have issues] Adjust the Filament Drive Lever Tension Bolt, shown by the orange arrow in the third image, so that the piece of paper between the Filament Bearing and Filament Drive Gear is tight but may be pulled out without tearing.

Be careful not to unscrew the Tension Bolt too far or the nut will come off the bolt and the spring will come off!

From time to time when you're 3D printing, you'll need to clean plastic out of the Filament Drive Gear's teeth. You can use a dental pick, or a tack to do this.