PTFE vs PEEK Anyone tried using PEEK (polyetheretherketone) in place of PTFE for the extruder? https://reprap.org/forum/read.php?14,10736,10736#msg-10736 Sat, 14 Mar 2026 18:41:21 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?14,10736,157187#msg-157187 Re: PTFE vs PEEK https://reprap.org/forum/read.php?14,10736,157187#msg-157187 anirudh Mechanics Thu, 27 Sep 2012 12:20:48 -0400 https://reprap.org/forum/read.php?14,10736,16299#msg-16299 Re: PTFE vs PEEK https://reprap.org/forum/read.php?14,10736,16299#msg-16299 nophead Mechanics Fri, 29 Aug 2008 09:56:25 -0400 https://reprap.org/forum/read.php?14,10736,16297#msg-16297 Re: PTFE vs PEEK https://reprap.org/forum/read.php?14,10736,16297#msg-16297 -------------------------------------------------------
>
> It is definitely molten at the junction of the
> PTFE and the heater barrel because if you dont
> seal the thread it leaks out.
>
Not in my extruder design. The junction in mine rarely exceeds 80 C. :)-D]]> Forrest Higgs Mechanics Fri, 29 Aug 2008 09:22:48 -0400 https://reprap.org/forum/read.php?14,10736,16296#msg-16296 Re: PTFE vs PEEK https://reprap.org/forum/read.php?14,10736,16296#msg-16296
Quote

That's not something that you want to happen.

Yes but unless you have a perfect insulator that is what happens. The heater is at say 230C, ABS melts at 105C. so the PTFE is hot enough to melt it some significant distance down its length.

It is definitely molten at the junction of the PTFE and the heater barrel because if you dont seal the thread it leaks out.]]> nophead Mechanics Fri, 29 Aug 2008 09:04:30 -0400 https://reprap.org/forum/read.php?14,10736,16293#msg-16293 Re: PTFE vs PEEK https://reprap.org/forum/read.php?14,10736,16293#msg-16293 Forrest Higgs Mechanics Fri, 29 Aug 2008 08:52:36 -0400 https://reprap.org/forum/read.php?14,10736,16288#msg-16288 Re: PTFE vs PEEK https://reprap.org/forum/read.php?14,10736,16288#msg-16288
BTW, the reason PTFE gets longer is simply thermal expansion. You have to warm it up to the extrusion temperature and give it time to expand before you calibrate your z-axis because the amount it expands at 230C is about 0.5mm, more than a layer height.

I also start my raft with a 1mm thick widely spaced base layer with the head set lower. That compensates for a slight inaccuracy in z (my machine frame is wood so it varies with weather). If the head is a little low the first layer has room to expand sideways, if too high it expands vertically. The last layer of the raft is then exactly at the right height and level.]]> nophead Mechanics Fri, 29 Aug 2008 06:52:54 -0400 https://reprap.org/forum/read.php?14,10736,16287#msg-16287 Re: PTFE vs PEEK https://reprap.org/forum/read.php?14,10736,16287#msg-16287
[at.rs-online.com]

According to this data sheet is has:
Max. service temperature
short term ]]> wizard23 Mechanics Fri, 29 Aug 2008 06:03:19 -0400 https://reprap.org/forum/read.php?14,10736,10739#msg-10739 Re: PTFE vs PEEK https://reprap.org/forum/read.php?14,10736,10739#msg-10739
i made some tests with thin PEEK sheets, on which i placed conducting glue and tempered in the oven at 120]]> VDX Mechanics Tue, 01 Apr 2008 15:16:01 -0400 https://reprap.org/forum/read.php?14,10736,10737#msg-10737 Re: PTFE vs PEEK https://reprap.org/forum/read.php?14,10736,10737#msg-10737 en.wikipedia.org] that it has a glass transition temperature at 130-150C. My understanding is that it will become flexible, possibly rubbery at that point so it may give way mechanically a lot sooner than PTFE.]]> nophead Mechanics Tue, 01 Apr 2008 14:54:10 -0400 https://reprap.org/forum/read.php?14,10736,10736#msg-10736 PTFE vs PEEK https://reprap.org/forum/read.php?14,10736,10736#msg-10736 degroof Mechanics Tue, 01 Apr 2008 14:05:03 -0400