Just a bit of an update:
We have (after going through many different brands and sizes) found a really really nice pneufit coupler. It's made of all Delrin (POM) so is super slick and self lubricating, the insides of the fitting are well matched to the diameter of the filament and best of all they have a really nice smooth tapered internal that guides filament smoothly through with no catching or jamming.
They use an awkward 1/8th Inch BSPP thread - but this is pretty much standard on pneumatic fittings. I am having a hard time getting a tap locally, but have one on the way next day delivery.
The heatsink is already drilled and ready for the thread to be cut, all I need is a tap. Also waiting on PFA tubing from a UK supplier, but this should be along in the next day or two also.
I don't have an ultimaker to fit this to, but I should at least have some solid confirmation of it functioning as a bowden extruder in its own right in the next few days.
I have had some really kind offers from the community for testing and helping to fit these to an ultimaker with a printable mounting system of some sort. Thanks to all those who have been in touch.
Will keep you updated as things progress.
Sanjay
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