New idea for insulating a hot end rapidly

Topics around mechanical design, controller and electronics. Mods & hacks welcome.
AR_LA
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Re: New idea for insulating a hot end rapidly

Postby AR_LA » Wed Nov 15, 2017 8:32 pm

Typically with that sort of product it's the adhesive that has the lower temp rating. It can release gas or fail altogether at high temps.

I just ordered some of the fiberglass tubing as well as the silicone coated fiberglass tubing. To try out. I have been using just high temp silicone rubber cut to wrap the hot end, secured with fiberglass tape.

Keep in mind even high temp Kapton tape has a max temp rating of 500F, and again it's the rating of the adhesive, but people use it all the time. A little insulation between the tape and the hot end goes a long way.

firesped
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Re: New idea for insulating a hot end rapidly

Postby firesped » Thu Nov 16, 2017 2:35 am

and in case you were wondering what kapton tape looks like when you burn it.

IMG_0935a.JPG


This was removed from the hotend that had a thermal runaway. It was insulated with kapton layer, ceramic fiber layer and another kapton layer outside that. I have no clue how hot it actually got.
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zemlin
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Re: New idea for insulating a hot end rapidly

Postby zemlin » Thu Nov 16, 2017 7:02 pm

Hadn't considered the potential benefits of insulation - and it's a simple enough task.
My Makergear printer uses a glass-lined stretchy silicone sleeve.
I decided I'd try these:

https://www.mcmaster.com/#7569k12/=1aa7grf

https://www.mcmaster.com/#2573k18/=1aa7gju
If the second one ends up being a better solution, I'll have about 9' of insulating tubing to get rid of for cheap. Stay tuned. :P

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Michael.P@Raise3D
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Re: New idea for insulating a hot end rapidly

Postby Michael.P@Raise3D » Thu Nov 16, 2017 8:27 pm

@zemlin,

That is one way to go about it! I have gotten annoyed with my printer at home, the hotend is not insulated at all and when testing the BVOH I am having to clean off the extruder blocks quite a bit. I might have to take you up on the offer if it works out for you.
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Noren
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Re: New idea for insulating a hot end rapidly

Postby Noren » Thu Nov 16, 2017 8:48 pm

I checked the rating of the hose you linked to. And it’s only rated for 390°F (200°C). Do you think that is enough? If it is I have a similar product in a local shop with the same rating I would like to try out.

zemlin
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Re: New idea for insulating a hot end rapidly

Postby zemlin » Thu Nov 16, 2017 10:03 pm

Noren wrote:I checked the rating of the hose you linked to. And it’s only rated for 390°F (200°C). Do you think that is enough? If it is I have a similar product in a local shop with the same rating I would like to try out.

The heavier hose is good to 500F. I will compare the thinner tube to what I've had on the Makergear printer when it arrives. It sounds like the same stuff though - and it's surviving a 250C and hotter hot end on that machine. If I'm wrong, I might have a mess on my hands.

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Noren
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Re: New idea for insulating a hot end rapidly

Postby Noren » Thu Nov 16, 2017 10:06 pm

Ok. The tube i have locally is rates 200°C but has a melting point of 600°C. Guess a try and observation is the way to go. ;)

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Michael.P@Raise3D
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Re: New idea for insulating a hot end rapidly

Postby Michael.P@Raise3D » Thu Nov 16, 2017 11:27 pm

Keep a close eye on it, we dont want anything happening to you!
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AR_LA
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Re: New idea for insulating a hot end rapidly

Postby AR_LA » Fri Nov 17, 2017 2:43 am

And beware of the fumes from whatever adhesive is used.

AR_LA
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Re: New idea for insulating a hot end rapidly

Postby AR_LA » Fri Nov 17, 2017 4:06 pm

Just wanted to build off of John's original post. The 3/4" tubing looked like it had some extra space, so I tried out 5/8", and it's nice and snug. Here's 5/8" ID silicone covered fiberglass like Jetguy mentioned earlier. Purchased from McMaster-Carr

I'm not sure how it's going to hold up to temps over 260C. I read some papers about the affects of high heat on silicone, and it looks to affect modulus, elasticity, etc... but nothing to really let me know what to expect with prolonged, and cyclical exposure to 300Cish. For the last year or so I've just been using silicone over my hot ends and it showed no signs of damage, but the hottest print I did was just a 12hr poly-plus at like 260. I think it'll be fine, but I'm no expert here.
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IMG_2861.JPG

zemlin
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Re: New idea for insulating a hot end rapidly

Postby zemlin » Fri Nov 17, 2017 5:20 pm

Is that
https://www.mcmaster.com/#8772k56
or
https://www.mcmaster.com/#6172t14
Wish those had turned up when I did my searching - would have added them to the order.

AR_LA
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Re: New idea for insulating a hot end rapidly

Postby AR_LA » Fri Nov 17, 2017 6:19 pm

6172T14, but the other should work just as well. I also got 88155K63 but that just wants to unravel when you look at it.

firesped
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Re: New idea for insulating a hot end rapidly

Postby firesped » Fri Nov 17, 2017 9:03 pm

the ceratex cermic fiber cloth tape I am using is rated for 1,800 °F. for Continuous Use, 2300 °F Maximum. the ceratex was fine, it was the kapton tape that burned.
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DrewPetitclerc
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Re: New idea for insulating a hot end rapidly

Postby DrewPetitclerc » Mon Nov 20, 2017 7:21 am

You should check out my post here.
viewtopic.php?f=4&t=4634#p21471
Could be helpful.
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JohnSays
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Re: New idea for insulating a hot end rapidly

Postby JohnSays » Tue Nov 28, 2017 6:29 pm

Depends on what you print with. Most of my printing is done between 240C and 260C. The heat block is going to be very near those temperatures.
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