[s]Also evanalmighty there is no PEEK in an e3d v6, v5 yes, but not the V6.  The heat break is stainless and the heat sink is aluminum. That's it. [/s]

There is no PEEK in the E3Dv5 either, or any of E3D's products for that matter.

And as far as the other question I took my stock hotend flipped it over on the nozzle side drilled it dead center tapped it added another nozzle (bad part I didn't have the right drill bit so it was a little big, the nozzle wouldn't stay in) as far as the other end you would have to make some kind of a adapter to fit the thread where the throat screws in (DA Vinci was slick they use a 6mm skinny thread) and if you are able to do that next problem is the bottom bracket where the hotend bolts to  it has a I believe a 8mm opening.  I had a old aluminum small coupler I used drilled a bigger hole to fit the throat in.  If you are able to accomplished lastly you will have to cranked the bed down tremendously to make everything work.  In other words too much work

Another experiment I did was I bought another hot used the coupler I made to fill the gap so the the throat would sit in the bracket centered.  I'm not sure if the hotends block will work up against the bottom bracket so I put a oversized bolt which was about 3 to 4mm high in between the block and the bottom bracket. It printed good for a short while. I'm not sure if that throat was lined or I could have ruined it when I torched it, it started jamming.  The down side to this setup is the average throat is about 26mm long so for this to really work you would need at least a 30mm throat to make everything come together. I had to remove the fan just to get the filament loaded.

The reason if your asking about the 4 jaw is so you can move each of the jaws to ensure that it is running true other wise you will not be able to machine it accurately and will more than likely scrap it off

I'm going to make some of the E3D hot end parts out of super-alloys from work I think would be better

Wouldn't mind seeing how that goes. Keep us updated.

I'm going to make some of the E3D hot end parts out of super-alloys from work I think would be better

Have you got access to any machinery?

I don't, but I do have a brother-in-law (in another city) who has a machine shop. I've toyed with the idea of asking him to build parts out for me - presumably out of brass (hotend) and aluminum (throat)?

Have you got access to any machinery?

No.
What did you have in mind ?

I'd actually be interested in exploring the original question further - i.e.: can the stock throat be replaced with a PTFE-lined threaded tube (for example: http://amzn.to/1GfUqNv). If so, would the nozzle also need replacement? What impact would that have on proper functioning with stock firmware or Repetier firmware?

Have you actually looked in to these? They say on the video it can print any kind of filament thats out.... so they have clearly designed it right so that it can print PLA

Yep an e3d v6 will print pretty much anything you can throw at it

Just for fun I've been dialing in PLA on my v6. Here's a couple prints (attached).

And yes, the PTFE does go all the way through to the heatbrake.

It is a liner. The e3d v6 PTFE runs all the way to the end of the cold side of the heatbrake. Any area beyond the PTFE is the hot zone--the filament is supported all the way to the point that it melts. It doesn't need guidance inside the heatbrake because the polished walls of the heatbrake act as support. The few issues folks have with PLA on the v6, from my reading, arose with too much retraction.

http://swindon.hackspace.org.uk/blog/ho … nts/33.png

Here is an image of the cross sectioned E3D v6 barrel. The PTFE tube leads into the opening of the barrel and terminates.  So you can call it a liner if you want, but it doesn't act as one.  In order for the 'liner' to aid with printing PLA, it has to go as far down the hotend as possible.  Some hotends, like the ones made by CTC, even has the brass nozzle bored out so that the PTFE liner can go all the way into the nozzle.

https://lh4.ggpht.com/Ucm4KpTk1SwIoJUKp … SUV1m=s320

As you can clearly see the PTFE lining locates IN THE HOTEND and is all the way through

I can read engineering drawings just fine as I work in aerospace engineering and use engineering drawings which are more complex than the ones they supply....

I'm not having some one turn to me and say in lying when I have supplied an image which clearly shows what I said!!