Which pipe did you order? I replaced the extruder feeder with a spring loaded one and now it just clicks.. I can force filament through with my hand but by itself it just clicks as filament comes through erratically. I also changed the PTFE tubing but no luck.. At this stage I'm thinking an all metal hotend could be in order? But how do I know if it'll fit the CTC? Are they standard? Any recommendations from people who have swapped one out?