Small filament leak
Posted Jul 9, 2023, 9:23 PM UTC
19
I just dealt with this in my printer and it turned out to be a leak between my heatbreak and my heatblock. I wound up replacing both.
1
The last image in this article shows your issue.
https://help.prusa3d.com/article/changing-or-replacing-the-nozzle-mk2-5s-mk3s-mk3s_2069
Be sure to redo the first layer calibration when making a change to the hotend.
1
Ohh, so I would need to tighten the heatblock to the heatbreak?
2
Tighten the nozzle against the heatbreak. The heatblock is sort of along for the ride.
2
Hey everyone. Recently after I loosened my nozzle that was overtightened I started having this small filament leak. This is a second hand mk3s, that’s why the heat block is so dirty. Can I save this or do I need a new part? If so what do I need? Thanks!
How exactly was your nozzle over tightened? If nothing was broken or stripped then it wasn’t too tight. Your nozzle needs to be in tight contact with your ptfe* tube in the throat of the heatbreak or you’ll get leaking. You’ll need to clean everything then re-assemble correctly.
*depends on the style of your hotend, it wouldn’t be the ptfe for an all metal hot end. But the principle is the same, you need a tight seal between the heatbreak and nozzle inside the heater block, not a seal to the block.
It was overtightened as in it was touching the heat block causing heat creep
Wait what? That's the whole point of the nozzle? Heat creep occurs above that with either a poor heatbreak, heatsink, or cooling fan. Unscrewing your nozzle wouldn't change anything because the heatbreak is screwed into to the top of the heater block. But either way, if you unscrewed the nozzle then it won't be making good contact with the heatbreak and ptfe tube.
There's a load of videos on it, here's one I found quickly that has a model in it for you. https://www.youtube.com/watch?v=uKN0VOuul0o
Thanks! It’s a little confusing because it actually solved my heat creep.