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I currently have an issue where my filament is getting stuck in the extruder, and I believe it is because of a damaged teflon tube. I am trying to replace the tube but am stuck because I cannot access the end of the extruder tube that I need to replace the teflon. I have tried to remove the nozzle from the end of the tube but I have had no luck doing so. If anyone has any suggestions please tell me (I own a DaVinci.jr 1.0).