<p>The PTFE liner should be in contact with the nozzle, and is normally cut half a millimetre over-size to ensure that it remains in contact.</p>

CC BY-SA 4.0
2022-01-19T08:08:42.123Z
Thanks! That makes sense. To make it absolutely clear, that means that the right picture should be screwed into the heatblock, right?
zwep
CC BY-SA 4.0
2022-01-19T09:22:35.127Z
@zwep Yes. That end should be partially stopped, so that the PTFE tube cannot pass through it (but the filament can).
Mick
CC BY-SA 4.0
2022-01-18T20:36:16.903Z
2022-01-18T20:36:16.903Z
Mick
<p>I am trying to replace a Mk8 heatbreak on my printer. But which orientation do I need to put into the heatblock? The left image or the right image? Note that this specific heatbreak is missing a PTFE tube.</p>
<p><a href="https://i.sstatic.net/tIJLnm.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/tIJLnm.jpg" alt="enter image description here" /></a>   <a href="https://i.sstatic.net/Q3Gnmm.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/Q3Gnmm.jpg" alt="enter image description here" /></a></p>
<p>I quickly looked at the other questions on this forum but could not find a clear result with images.</p>

<heat-break>
Replacing PTFE tube in Mk8 heatbreak
zwep
# Replacing PTFE tube in Mk8 heatbreak

(Asked by: username_0 on 2022-01-18)

I am trying to replace a Mk8 heatbreak on my printer. But which orientation do I need to put into the heatblock? The left image or the right image? Note that this specific heatbreak is missing a PTFE tube.

[![enter image description here](https://i.sstatic.net/tIJLnm.jpg)](https://i.sstatic.net/tIJLnm.jpg) [![enter image description here](https://i.sstatic.net/Q3Gnmm.jpg)](https://i.sstatic.net/Q3Gnmm.jpg)

I quickly looked at the other questions on this forum but could not find a clear result with images.

**Tags:** heat-break


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## 1 answers

### Answer by username_1 on 2022-01-18. Score: 1 | Accepted answer

The PTFE liner should be in contact with the nozzle, and is normally cut half a millimetre over-size to ensure that it remains in contact.

> **Comments:**
> **username_0**: Thanks! That makes sense. To make it absolutely clear, that means that the right picture should be screwed into the heatblock, right?  
> **username_1**: @username_0 Yes. That end should be partially stopped, so that the PTFE tube cannot pass through it (but the filament can).  

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