Bowden setup keeps jamming between PTFE tube and heatsink

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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?

Hellrazor

Posted 2019-12-24T08:22:38.567

Reputation: 91

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 – 2019-12-24T13:54:21.253

Do you have cooling fan for the e3d heatsink ? – Mayoogh Girish – 2019-12-28T14:00:57.887

Can you show a picture of your setup? – Trish – 2020-01-24T15:04:42.293

Answers

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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

Maybe chamfering your tubes works for you too.

0scar

Posted 2019-12-24T08:22:38.567

Reputation: 25 570

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 – 2020-01-20T15:46:12.833

@Hellrazor You can find printed objects on Thingiverse, if you are still able to print small parts; e.g. this.

– 0scar – 2020-01-20T17:46:12.660