Nozzle/hotend junction leaks

[jaysenodell 18]

while this may not "seem" like it's improviing my prints, it is. mostly becuase I'm back to large scale/volume and the blobs can be a problem. 

 

I can not get the noz and the hotend to seal. I'm constantly getting ooze out of the junction. it's impossible to get the damn nozzle off the block even at "the booger string is on fire" temps so I know the noz is tight. While I haven't surfaced the hotend or noz, I have checked for flat and I beleive we are within spec of 0.001 on both. I'm avoiding tape because that seems wrong. In the course of a 1kg run I'm getting about 3g of "clump" i'm removing from the noz (under the silcone sleeve, off the block, dropped on the plate) and that not counting what I'm losing at noz/block clean out (chemical and flame because who has time for that?). 

 

And yes... creality hotend, but the measurements are good. Just looking for a better way to seal it up. 

[Slashee_the_Cow 410]

On 8/7/2024 at 10:18 PM, jaysenodell said:

it's impossible to get the damn nozzle off the block even at "the booger string is on fire" temps so I know the noz is tight.

Possibly a stupid question because this really is more of an @GregValiant sort of problem but... is there such a thing as too tight? If you're putting too much pressure on the hot end it could maybe start to force it apart or make the head of the nozzle force its way into a bit which is only designed to be big enough for the thread (we are talking Creality quality here) which would create a channel where it could leak.

[jaysenodell 18]

37 minutes ago, Slashee_the_Cow said:

is there such a thing as too tight?

There could be, but I've also had the "nozzle fall off" when these things aren't crammed on there. This happens with both hardened steel and standard brass. It is possible that the block is cracked or has a hole that I'm not seeing, but it has to run right next to the threads and act counter to the normal expansion properties of metal...