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Filament leaking after changing nozzles  

Active Member
Filament leaking after changing nozzles

I attempted my first nozzle change from the stock nozzle to a 0.25, but the new nozzle would not fit well. I had to really struggle to screw it in, but eventually I did get it to fit. However, now filament is oozing and piling up on top of the heater block, and in that small gap between the nozzle and hot end. I can't print things longer than a few hours because it starts to ooze up and drip into the print.

I have completely disassembled the hot end and checked it, cleaned it, and reassembled it, but the problem persists. I've put the original nozzle back in, and it still leaks. I did follow a YT video on disassembling the hot end, so my next guess is to follow the official written steps instead.

Is this something I need to replace or can it be fixed? If I need to replace it, should I get another stock hot end or upgrade? Any recommendations would be greatly appreciated.

Posted : 09/09/2021 5:59 am
Two things

It is hard to tell with the filament leakage on it.  

  1. It looks like you are leaking above the heat block between the heat block and heat sink.  If it is, you are assembled incorrectly.  See the image below.  
  2. Your nozzle is not against your breakbreak on the inside.  It might need to be tightened.  Check 1 first because if 1 is wrong, you can not fix 2.  

Chuck H
3D Printer Review Blog

Posted : 09/09/2021 9:18 am
Active Member
Topic starter answered:
Loose Heat Break

I don't quite know how, but when I was changing nozzles, I pushed the heat break up a bit, and that's where it was spilling from. I took apart the entire thing, which was difficult since there was melted plastic all over it (I did have to heat up the hot end a bit to screw the heat break back in), but now it's working perfectly.

Thank you for your help.

Posted : 14/09/2021 2:56 am