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Topic: RTV silicone for thermister?

The last couple crappy cheap hotends I have purchased (learning my lesson and setting aside some scratch for the E3D) have basically just had their thermisters shoved in a hole on the hotend and held in with kapton tape. I was thinking about doing this more effectively on my new merlin hotend, and I was planning on putting some silica heat transfer compound on the thermister before insertion. I was wondering if anybody has used red RTV high temp silicone to plug the hole and hold everything in place as opposed to just wrapping the butts out of it with kapton tape. It seems like it would be a good option, since it can handle the heat and is pretty easy to cut/pry/scrape off if you need to.

Basically, I just wanted to see if anybody else had run into trouble with this method before I sacrificed a hotend to the hotend gods.

SD3 w/ RUMBA (8825s), merlin hot end (in pieces). Ender3 w/ silent board for PLA printing. Ender5 w/ silent board, e3d v6, new z lead screw, and glass bed. DiY Kossel w/ smoothieboard (in pieces). Vellman Vertex (in pieces)
Shapeoko2 router in process of being converted to laser engraver (in pieces)
Multicam 5000 series CNC Router w/ 11HP spindle, 5x10' table, and auto tool changer (in pieces)

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Re: RTV silicone for thermister?

A good read for everyone and maybe even the answer to your question.
http://www.soliforum.com/topic/5494/how … d-hotends/

Printit Industries Model 8.10 fully enclosed CoreXY, Chamber heat
3-SD3's & a Workbench all fully enclosed, RH-Slic3r Win7pro, E3D V6, Volcano & Cyclops Hot End
SSR/500W AC Heated Glass Bed, Linear bearings on SS rods. Direct Drive Y-axis, BulldogXL
Thanks to all for your contributions

3

Re: RTV silicone for thermister?

Thank you! That answers my silicone question but I noticed he didn't use any heat transfer compound on the thermister. Now i'm second guessing that hmm I guess I will just have to try and see!

SD3 w/ RUMBA (8825s), merlin hot end (in pieces). Ender3 w/ silent board for PLA printing. Ender5 w/ silent board, e3d v6, new z lead screw, and glass bed. DiY Kossel w/ smoothieboard (in pieces). Vellman Vertex (in pieces)
Shapeoko2 router in process of being converted to laser engraver (in pieces)
Multicam 5000 series CNC Router w/ 11HP spindle, 5x10' table, and auto tool changer (in pieces)

4

Re: RTV silicone for thermister?

Either way will be fine, don't over think it wink

Printit Industries Model 8.10 fully enclosed CoreXY, Chamber heat
3-SD3's & a Workbench all fully enclosed, RH-Slic3r Win7pro, E3D V6, Volcano & Cyclops Hot End
SSR/500W AC Heated Glass Bed, Linear bearings on SS rods. Direct Drive Y-axis, BulldogXL
Thanks to all for your contributions

5

Re: RTV silicone for thermister?

Overthinking is what separates man from the animals!

SD3 w/ RUMBA (8825s), merlin hot end (in pieces). Ender3 w/ silent board for PLA printing. Ender5 w/ silent board, e3d v6, new z lead screw, and glass bed. DiY Kossel w/ smoothieboard (in pieces). Vellman Vertex (in pieces)
Shapeoko2 router in process of being converted to laser engraver (in pieces)
Multicam 5000 series CNC Router w/ 11HP spindle, 5x10' table, and auto tool changer (in pieces)

6

Re: RTV silicone for thermister?

TheBaron wrote:

Overthinking is what separates man from the animals!

Shows just how little I really know.  I always thought it was self awareness wink

Printit Industries Model 8.10 fully enclosed CoreXY, Chamber heat
3-SD3's & a Workbench all fully enclosed, RH-Slic3r Win7pro, E3D V6, Volcano & Cyclops Hot End
SSR/500W AC Heated Glass Bed, Linear bearings on SS rods. Direct Drive Y-axis, BulldogXL
Thanks to all for your contributions

7

Re: RTV silicone for thermister?

My stuck-up princess of a dog has self awareness, but I've never seen her spend an hour worrying about if the generic thermal compound in the house is made to handle temperatures over 200C.

SD3 w/ RUMBA (8825s), merlin hot end (in pieces). Ender3 w/ silent board for PLA printing. Ender5 w/ silent board, e3d v6, new z lead screw, and glass bed. DiY Kossel w/ smoothieboard (in pieces). Vellman Vertex (in pieces)
Shapeoko2 router in process of being converted to laser engraver (in pieces)
Multicam 5000 series CNC Router w/ 11HP spindle, 5x10' table, and auto tool changer (in pieces)