Leaking nozzle/hotend  

Pay particular attention to the diagrams at the bottom of this page:

https://help.prusa3d.com/en/article/changing-or-replacing-the-nozzle-mk2-5s-mk3s-mk3s_2069

Cheerio,

RE: Leaking nozzle/hotend

Leaking nozzle/hotend

Hello, I've been printing for 6 month with the nozzle that comes with the printer, but a week ago I change it for the nozzle x from E3D. After printing small size object in order to test my new filaments that I bought along with it, and everything seemed to be working, the little cats prints went very well. So I decided to print some bigger object a medium sized vase,  this print was full of black chunk of burned filament. And after doing some test I found out that the nozzle was heavy leaking as you can see in the figure, it is leaking from the threads of the hotend. Unfortunately I have no idea why it is leaking, because I installed the nozzle full in till it can go.

If you have any suggestion, your help would be really appreciated.

Thank you in advice.

As mentioned above, I would look at the nozzle installation. It looks like the heat break is not making a solid contact with the nozzle. One possible check (if there isn't melted plastic on the top of the heat block,) is when it is cold. Carefully try and turn the heat block and see if it moves. (mind the heater cables) and if it spins, that is a sign that the nozzle and heat break are not snug against one another. 

RE: Leaking nozzle/hotend

First of all, thank you for the fast response. I did take out the hotend and i tried to move the the heat block but it didn't move at all, although as you can see in the picture there is a little bit of plastic, but it could already been in there from a couple of failed stamp that i had a long time ago. What would you suggest me to do.

Thank you again for you help.

RE: Leaking nozzle/hotend

Posted by: @diem

Pay particular attention to the diagrams at the bottom of this page:

https://help.prusa3d.com/en/article/changing-or-replacing-the-nozzle-mk2-5s-mk3s-mk3s_2069

Cheerio,

I did strictly followed the Prusa guide and the video for the installation of a new nozzle. But i have a question, i installed the nozzle when the temperature was set to 280 degree and I tightened the nozzle into place, but after it cools down should I tighten it again. 

Thank you for your help.

RE: Leaking nozzle/hotend

the idea of tightening when hot, is that it secures the nozzle more firmly than you can manager when cool. 
so the answer to your question is NO you should not try to re tighten the nozzle when cold

regards Joan

RE: Leaking nozzle/hotend

Thank you

RE: Leaking nozzle/hotend

First of all, thank you for the fast response. I did take out the hotend and i tried to move the the heat block but it didn't move at all, although as you can see in the picture there is a little bit of plastic, but it could already been in there from a couple of failed stamp that i had a long time ago. What would you suggest me to do.

Thank you again for you help.

Hiya. 

Even with the previous blob, based on the photos and what you mentioned, I would say its a loose connection as it looks like plastic oozed its way from the top and bottom of the heat break. For the nozzle side, you could heat it up and use a wire brush to remove the plastic (be careful about the heater cartridge calbe). For the top, you could try and remove it with that butter knife everyone has as a back up screw driver to try and remove the plastic. 

You want to be a bit careful with the temps as you want to soften / melt the plastic, not bake it onto the hotend as then its a bit difficult to get off. 

Those are the right instructions to use and it can take a bit of time to make sure you get it on right, and then afterwards you want to double check your first layer calibration, (write down what your current setting is, reset to 0.000, re-run the calibration and move the height to the original value while checking to see if it is still correct) 

RE:

Ok thank you, but after i cleaned it up, should i reinstall the nozzle, in order to solve the leakage problem. Because when testing for try to found what the problem was, i cleaned all and then printed again, and i had the same leaking problem.

RE: Leaking nozzle/hotend

yes you had right, while cleaning the hotend and the nozzle i found out that the hotend is very loose. So now i should take the hotend and the nozzle a part and reassemble it ?

Tank again for the patient.

the hotend is very loose

This is probably the root of the problem.  Yes, investigate, clean and rebuild is the best plan.

Cheerio,

RE: Leaking nozzle/hotend

Thanks i will rebuild it, i also found the the thermostat wire i is slightly damage and i can see the wire, can i just rapier it with a bit of black tape.

Very unlikely.   The part gets too hot for tape and most solder melts around 190C so it's too hot for that too...

It's cheapest to replace the part.

Cheerio,

RE: Leaking nozzle/hotend

I really wanted to try to fix it, because it's a very little scratch and i don't feel like spending more money.

You're welcome to try.

Cheerio,

RE: Leaking nozzle/hotend

If it's just the insulation that's damaged, and none of the wire strands are broken, you could try using some high temp silicone RTV on it.

RE: Leaking nozzle/hotend

Yes, thank you all now evrything works fine.