<p>Kapton tape would be the logical material. It's unfortunate that your vendor did not supply that as a separate item, rather than sticking it to the "cotton" (I'm guessing not actually cotton, as things might get a bit scorching for cotton, so I'm assuming some type of ceramic fiber or the like.)</p>

CC BY-SA 3.0
2017-07-03T14:17:56.800Z
"heating block cotton" is just the common name, the insulation is made of ceramic fiber.  I suspect the pieces are intended to replace the existing material.  I was wanting to try to use it to insulate the other two sides.
markshancock
CC BY-SA 3.0
2017-07-03T15:39:21.817Z
So, cut/punch a hole in a chunk for the filament input tube, stick it over the top, wrap it the "other" way (you may also have to make cutouts for various wires not illustrated...) and kapton-tape the flaps to the bottom after wrapping the ends. That will get you a double-layer on top. Or cut small chunks just to cover the ends and kapton-tape them to the top, bottom and sides, but if you have adequate material to go over the top twice, why not?
Ecnerwal
CC BY-SA 3.0
2017-07-03T19:43:03.637Z
I am considering that; but, that might require disassembling the extruder which I am not sure is worth the effort.
markshancock
CC BY-SA 3.0
2017-07-04T03:13:27.273Z
So, make a slit from an edge to the hole (and to any other holes needed for wires) so you can get it on without disassembling. If need be you can tape those up.
Ecnerwal
CC BY-SA 3.0
2017-07-03T01:32:00.190Z
2017-07-03T01:32:00.190Z
Ecnerwal
<p>Not quite the answer to the question but closely related, so I venture. I use ordinary wool thread to insulate the hot end. I just wrap it carefully so it is covered everywhere. Very low cost, very effective. Wool can handle even the hottest extrusion temperatures easily.</p>

CC BY-SA 4.0
2018-09-30T20:50:34.093Z
2018-09-30T20:50:34.093Z
MaybeLater
<p>I bought some heating block cotton to insulate the exposed surface of my hot end.  I thought the yellow as double-sticky but it appears to be Kapton.</p>

<p>What can I use to attach it to the extruder?</p>

<p><a href="https://i.sstatic.net/9FFOY.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/9FFOY.jpg" alt="enter image description here"></a></p>

<p>My extruder is already covered on four sides.  I want to cover the other two.<a href="https://i.sstatic.net/VLyKX.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/VLyKX.png" alt="enter image description here"></a></p>

<extruder>
How to attach insulation to Hot End
markshancock
# How to attach insulation to Hot End

(Asked by: username_0 on 2017-07-02)

I bought some heating block cotton to insulate the exposed surface of my hot end. I thought the yellow as double-sticky but it appears to be Kapton.

What can I use to attach it to the extruder?

[![enter image description here](https://i.sstatic.net/9FFOY.jpg)](https://i.sstatic.net/9FFOY.jpg)

My extruder is already covered on four sides. I want to cover the other two.[![enter image description here](https://i.sstatic.net/VLyKX.png)](https://i.sstatic.net/VLyKX.png)

**Tags:** extruder

---

## 2 answers

### Answer by username_1 on 2017-07-03. Score: 2

Kapton tape would be the logical material. It's unfortunate that your vendor did not supply that as a separate item, rather than sticking it to the "cotton" (I'm guessing not actually cotton, as things might get a bit scorching for cotton, so I'm assuming some type of ceramic fiber or the like.)

> **Comments:**
> **username_0**: "heating block cotton" is just the common name, the insulation is made of ceramic fiber.  I suspect the pieces are intended to replace the existing material.  I was wanting to try to use it to insulate the other two sides.  
> **username_1**: So, cut/punch a hole in a chunk for the filament input tube, stick it over the top, wrap it the "other" way (you may also have to make cutouts for various wires not illustrated...) and kapton-tape the flaps to the bottom after wrapping the ends. That will get you a double-layer on top. Or cut small chunks just to cover the ends and kapton-tape them to the top, bottom and sides, but if you have adequate material to go over the top twice, why not?  
> **username_0**: I am considering that; but, that might require disassembling the extruder which I am not sure is worth the effort.  
> **username_1**: So, make a slit from an edge to the hole (and to any other holes needed for wires) so you can get it on without disassembling. If need be you can tape those up.  

---

### Answer by username_2 on 2018-09-30. Score: 0

Not quite the answer to the question but closely related, so I venture. I use ordinary wool thread to insulate the hot end. I just wrap it carefully so it is covered everywhere. Very low cost, very effective. Wool can handle even the hottest extrusion temperatures easily.


---

