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?

  • $\begingroup$ 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! $\endgroup$
    – 0scar
    Dec 24, 2019 at 13:54
  • $\begingroup$ Do you have cooling fan for the e3d heatsink ? $\endgroup$ Dec 28, 2019 at 14:00
  • $\begingroup$ Can you show a picture of your setup? $\endgroup$
    – Trish
    Jan 24, 2020 at 15:04

1 Answer 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

Maybe chamfering your tubes works for you too.

  • $\begingroup$ 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? $\endgroup$
    – Hellrazor
    Jan 20, 2020 at 15:46
  • $\begingroup$ @Hellrazor You can find printed objects on Thingiverse, if you are still able to print small parts; e.g. this. $\endgroup$
    – 0scar
    Jan 20, 2020 at 17:46

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