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Cut a 23mm length of PTFE and insert it fully into the top of the heatbreak.

To reduce the possibility of jams, ensure that both ends of the PTFE are cut squarely and the ends are not deformed, we recommend using a sharp knife rather than scissors for this.

Slide the 1.75mm filament guide over the protruding PTFE. The flat side of the guide should be flat with the back of the lid.

Ensure that the guide sits flush against the Aero sink. It is preferable to get the tubing too short, rather than too long