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The tubing should be inserted from the top of the now assembled hotend and pushed as far down into the hotend as possible.

The PTFE tube actually runs through the Heat Sink and into the Heat Break, please ensure the tubing as seated as deep into the hotend as possible.

The tubing passes right through the heatsink and into the heatbreak. Below is an illustration of how far down the PTFE tubing must extend. The second photo is not an assembly step, just an illustration of what should be happening inside your hotend.

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