I have a Creality Ender 3 for my class to introduce 3D printing to high school students. We made almost 20 prints before the filament stopped coming to the extruder. I was introducing my students to reverse engineering when we saw the tube pop out where the filament entered. My students cleaned the heating element and extruder until they could literally see through it and we reassembled all the components. We left the seal on, only for me to come back the next morning to find the hose popped back out and the extruder was clogged again. Lesson learned: This pipe can't handle 210 degrees and the hole is slightly off-center. Solution: replace. Hose with Steinbock and the printer works perfectly.
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