Unclog the print nozzle
Unclogging the extruder
Unclogging the nozzle
Featuring: Mark Wheadon
Some of the filament guide covers use Torx-head screws and some Phillips-head screws, and the colors may vary as well.
The comments on YouTube that accompany the videos are also worth reading. (To reach those, click on the word "YouTube" within each player window.)