⬢Carefully pull out the old PTFE tube from the heatsink using pliers or tweezers.
⬢Use your phone LED flash or similar device to shine into the hole from the top of the print head. Take a look inside and check there is no filament in the bottom of the heatbreak. It must be clean and you should see only the metal surface inside. Open the full-size image if needed.
A clean print head is essential for successful prints. Double-check, there is no filament inside!!!
⬢Mount the "lower" fitting to the top of the heatsink. Screw it all the way, but don't tighten it. As soon as you reach the end of the thread, release it by a full turn (360 °).
Pay attention to the correct orientation of the fitting. Insert the coarse-threaded side into the heatsink.
⬢Push the heaterblock up against the fitting with a reasonable force. No need to bend the entire axis. This will pre-stress the PTFE tube inside. Now, it is important to keep the slight upwards pressure.
⬢Make sure the heaterblock is aligned with the heatsink. If not, realign it, but keep the pressure.
⬢While holding the heaterblock from below (pressing the tube inside), tighten all three grub screws.
⬢Now, you can release the heaterblock. Make sure it doesn't move. If so, the grub screws were not tightened properly. Release them and return to the beginning of this step.
It is crucial there is no gap between the PTFE tube and other parts of the hotend. This is why we are "pre-stressing" it.
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