> Anyway, right now I'm leaning towards using a threaded dual cooling bar (eg
> Carl's) and M6-by-hose-barb fittings in the left extruder slot. Aluminum's
> conductivity is so high that a few square centimeters of cross-section is
> functionally zero resistance to heat flux. So cooling through the left
> extruder slot's thermal barrier tube threads should also cool the right
> extruder thermal barrier with high efficiency.
> The challenge there, of course, is routing the tubing so it doesn't hang
> below the primary nozzle. McMaster doesn't have a lot of M6 fittings so
> finding an appropriate elbow is looking to be painful.
Random thought.
You canreadily source soft copper refrigeration tubing in 1/8 and 3/16" ODs.
(Problem is, you end up with 10 feet of the stuff.) Sweat soldering it onto
a brass fitting is fairly straight forward (as long as you flux it first).
You do have to be careful bending it in a tight radius: even soft copper
tubing will happily collapse on the bend if you aren't careful.
I'm not sure if the above qualifies as simple enough for lay people to do.
Doesn't require a machine shop, but does require a cheap ass torch, flux,
and some plumbing solder. You could dispense with the soldering if you
went the flare fitting route with a flaring tool, but that's going to be
a larger fitting overall.
And then there's things like this,
http://www.ebay.com/itm/like/260448592717?lpid=82&chn=ps
Festo makes lots of those as well (QS, Quick Star line).
Dan