What is the specification for the thermal grease for the hotend please?
There’s a picture on bambu wiki of a tube of stuff that you can’t buy here, so I need a different one, but there’s no spec provided by Bambu. It’s hard to match exactly the shown product so it would be easier if I knew what thermal conductivity it actually needed etc
I don’t know what part of the world you’re in but I purchase mine (boron nitride paste) from Filafarm in Germany. Boron nitride paste can also be found on amazon.
Thank you, I am able to get this from a local 3d printer store, However, how do we know it’s the correct spec for a bambu?
Bambu or not, it’s a popular product to use for this application, I don’t think bambu has reinvented the wheel.
take into consideration the highest temperature level of your hotend according to BL, then add 10% on top and look for a thermal paste in that range.
OK, but why do some of these pastes not work for cpu coolers? (In fact the one suggested does not mention this use)
I know it’s something to do with the thermal conductivity, but what exactly makes the difference and how do we know it’ll be fine here?
Boron nitride paste is specialized for 3D printer hotends, where there are odd shaped small surfaces while CPU cooler thermal paste optimizes heat transfer between the CPU and cooler surfaces, preventing electrical issues and ensuring efficient cooling. The cpu cooler interface is a relatively large flat surface, a thin paste, (or ideally no paste and highly polished surfaces) is required.
I was unable to find documentation for boron nitride or an authorative article explaining the difference, so I just used the high end thermal grizzy stuff that’s tested and rated to 1000 degrees celcius as I know it’s used in industry as a high temp thermal glue.
Thermal grizzly doesn’t offer a paste rated at 1000C, their highest is Kryonaut Extreme at 350C, which is 2-3x more expensive than Boron Nitride. Boron Nitride is designed for 3D printing and dries out and won’t runout when heated up. CPU paste becomes more liquid at higher temps and more than likely will drain out of your hotend, even if it does work.
You really do not want a glue, you want to be able to replace the individual parts.