What is the hot end with the smallest orifice?

Dark Alchemist

Re: What is the hot end with the smallest orifice?
July 25, 2012 10:29AM

Registered: 11 years ago
Posts: 1,277

Quote
Dark Alchemist
YES, YES, I was thinking about airbrush nozzle as they have them long and slender and tiny orifices but I wondered if they could withstand the heat since an airbrush doesn't get hot.

Alright, I just reread what I wrote and all of that sounds like something out of a porno movie if we didn't know better. :/

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nophead

Re: What is the hot end with the smallest orifice?
July 25, 2012 11:41AM

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Registered: 17 years ago
Posts: 7,879

You would probably want to machine off some of the length as the longer the exit is the more pressure it takes to extrude. Also it would tend to cool being so thin compared to its surface area. Do we know if the aperture is tapered along the length of the pointy bit?

[www.hydraraptor.blogspot.com]

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Dark Alchemist

Re: What is the hot end with the smallest orifice?
July 25, 2012 11:48AM

Registered: 11 years ago
Posts: 1,277

One I saw was a long tube then the head which should?!? work as a guide for the filament? The one you are talking about just looks freaky and the filament would be too cool by the time, if it even could, exit the end.

Still, these aren't made for heat, and we do have a lot of heat on these, so I must wonder how well will they stand up?

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nophead

Re: What is the hot end with the smallest orifice?
July 25, 2012 12:50PM

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Registered: 17 years ago
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It looks like all one piece of brass, so it should handle the temperature. If it is too parts pressed or soldered together it might be a problem.

[www.hydraraptor.blogspot.com]

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Dark Alchemist

Re: What is the hot end with the smallest orifice?
July 25, 2012 06:42PM

Registered: 11 years ago
Posts: 1,277

nophead Wrote:
-------------------------------------------------------
> It looks like all one piece of brass, so it should
> handle the temperature. If it is too parts pressed
> or soldered together it might be a problem.

Exactly where my fear was but when you go on Ebay or look around a lot of them just don't say if one piece or not.

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theodleif

Re: What is the hot end with the smallest orifice?
July 26, 2012 04:17AM

Registered: 13 years ago
Posts: 1,918

They are made of stainless steel. I am already trying them out.

Only the sealing ring is of plastics and has to be removed. I let the steel cut its own thread into a 1.5 mm hole I drilled into the brass as this is the best sealing you can achieve without ptfe tape.

The filament string I got out has a diameter of 0.3 mm.

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Dark Alchemist

Re: What is the hot end with the smallest orifice?
July 26, 2012 06:20AM

Registered: 11 years ago
Posts: 1,277

theodleif Wrote:
-------------------------------------------------------
> They are made of stainless steel. I am already
> trying them out.
>
> Only the sealing ring is of plastics and has to be
> removed. I let the steel cut its own thread into a
> 1.5 mm hole I drilled into the brass as this is
> the best sealing you can achieve without ptfe
> tape.
>
> The filament string I got out has a diameter of
> 0.3 mm.
I'd have to see that to understand what you are talking about.

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VDX

Re: What is the hot end with the smallest orifice?
July 26, 2012 07:47AM

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Registered: 16 years ago
Posts: 13,891

... you should be able to use a copper or aluminium ring instead of the plastic one - we used such sealings (and gold rings) for vacuum and setups heated to >300°C ...

Viktor
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theodleif

Re: What is the hot end with the smallest orifice?
July 26, 2012 07:51PM

Registered: 13 years ago
Posts: 1,918

Dark Alchemist Wrote:

> I'd have to see that to understand what you are
> talking about.

Well, you simply take an airbrush nozzle like this one [www.ebay.de]. Then you take a 6 mm acorn nut made of brass. You drill a 1.5 mm hole into the top of the nut and screw the thread of the nozzle into it.

That's all.

Actually I didn't use an acorn nut, but made a heater block from copper. The .scad file shows you the dimensions.

Have fun. winking smiley