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Hotend leakage?

Posted by 09zx-6r 
Hotend leakage?
January 22, 2015 07:32PM
So after a few prints I started noticing build up around the nozzle just above the tapper and around the top of the nozzle block where it threads into the body...it's a Geeetech j-head v5...I tightened it while it was hot to take up any expansion...but it still leaks!!! Thoughts??
What's a better nozzle that has a really good price and worth it???
Re: Hotend leakage?
January 23, 2015 05:07AM
Contact nophead and buy one of his. They come already assembled which is worth a lot in itself.

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Printing with Mendel90 from fedora 25 using Cura, FreeCAD, MeshLab, OpenSCAD, Skeinforge and Slic3r tools.
Re: Hotend leakage?
January 23, 2015 09:58AM
In most cases, the hot ends are made of two or three types of metal, causing different rates and amounts of expansion when heated. The filament tube/throat is steel, the hot end block is aluminum and the nozzle is commonly steel or brass. With the relatively high thread pitch, leakage is common.

Also, assembly is a factor. Ideally, the filament tube will meet the nozzle inside the aluminum block, preventing any filament to even reach the threads. This is possible with almost any assembly, but rarely considered. Also, I have found that the use of a 6mm fiber washer and a thin M6 nut on the filament tube (on Mk7/Mk8 hot ends) prevents leaks.


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Re: Hotend leakage?
January 26, 2015 12:07AM
figured it out.... found a small crack in the threads where the plastic body enters the metal hot end block,,, as it heated up the crack expanded and leaked... a little JB weld and back in buisness... no leaks!!
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