If you end up making your own, I agree with Joergen, thread the bowden. I threaded mine M6 to fit the existing PEEK part and I never have problems with the hot end clogging or the bowden popping out.
Take a look at scottmayson's insulator here-
http://www.thingiverse.com/thing:20535
I think that would be a nice upgrade (in PEEK) if you have the tooling.
Kyle
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joergen 2
I'm not going to ask how you managed that...
Mcmaster sells PEEK rods, 5/8in diameter, and you can machine it to spec yourself (1/4in drill for the well, M6 drill&tap for the brass tube) to make some form of rim on the top.
http://www.mcmaster.com/#peek-rods/=howphm part 8503K232
while you are at it, you could consider scrapping the 1/4in well on top, and replace it with a section with an M7 tap, and also thread the bowden with a M7... this will eliminate any bowden decoupling events.
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