<p>Filament sometimes get stuck on the rim of the PTFE tubes inside the heat sink. Josef Prusa from Prusa Research has published a document on how you should chamfer the PTFE tubes for his printers:</p>

<p><a href="https://i.sstatic.net/DEOmA.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/DEOmA.png" alt="Josef Prusa PTFE tube chamfering"></a></p>

<p>Maybe chamfering your tubes works for you too.</p>

CC BY-SA 4.0
2020-01-20T15:46:12.833Z
Thank you everyone for your help. Sorry I took so long to respond. I didn't get a notification of your responses. I'd like to to try this chamfer of the ptfe tube but this seems like a difficult thing to pull off accurately with a tiny round tube. Do you think a pencil sharpener would work?
Hellrazor
CC BY-SA 4.0
2020-01-20T17:46:12.660Z
@Hellrazor You can find printed objects on Thingiverse, if you are still able to print small parts; e.g. [this](https://www.thingiverse.com/thing:3121653).
0scar
CC BY-SA 4.0
2019-12-24T21:03:42.370Z
2019-12-24T21:03:42.370Z
0scar
<p>I keep getting a jam where the PTFE tube meets the top of the v6 hot end. I have the PTFE tube all the away in but for some reason it gets a bulge at that spot and will stop printing. It happens with or without retraction. Any ideas?</p>

CC BY-SA 4.0
2019-12-24T13:54:21.253Z
I am thinking you mean the middle of the cold end instead of the hot end; above the top of the heat break. Could you add a sketch? Sometimes chamfering the tube helps!
0scar
CC BY-SA 4.0
2019-12-28T14:00:57.887Z
Do you have cooling fan for the e3d heatsink ?
Mayoogh Girish
CC BY-SA 4.0
2020-01-24T15:04:42.293Z
Can you show a picture of your setup?
Trish
<bowden><e3d-v6>
Bowden setup keeps jamming between PTFE tube and heatsink
Hellrazor
# Bowden setup keeps jamming between PTFE tube and heatsink

(Asked by: username_0 on 2019-12-24)

I keep getting a jam where the PTFE tube meets the top of the v6 hot end. I have the PTFE tube all the away in but for some reason it gets a bulge at that spot and will stop printing. It happens with or without retraction. Any ideas?

**Tags:** bowden, e3d-v6
> **Comments:**
> **username_1**: I am thinking you mean the middle of the cold end instead of the hot end; above the top of the heat break. Could you add a sketch? Sometimes chamfering the tube helps!  
> **username_2**: Do you have cooling fan for the e3d heatsink ?  
> **username_3**: Can you show a picture of your setup?  

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## 1 answers

### Answer by username_1 on 2019-12-24. Score: 1

Filament sometimes get stuck on the rim of the PTFE tubes inside the heat sink. Josef Prusa from Prusa Research has published a document on how you should chamfer the PTFE tubes for his printers:

[![Josef Prusa PTFE tube chamfering](https://i.sstatic.net/DEOmA.png)](https://i.sstatic.net/DEOmA.png)

Maybe chamfering your tubes works for you too.

> **Comments:**
> **username_0**: Thank you everyone for your help. Sorry I took so long to respond. I didn't get a notification of your responses. I'd like to to try this chamfer of the ptfe tube but this seems like a difficult thing to pull off accurately with a tiny round tube. Do you think a pencil sharpener would work?  
> **username_1**: @Hellrazor You can find printed objects on Thingiverse, if you are still able to print small parts; e.g. [this](https://www.thingiverse.com/thing:3121653).  

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