Black "Ooze" around Extruder

[felicitus 0]

Hi,

we're experiencing some black "ooze". It seems to be burned plastic - what can we do to fix that?

Thanks,

Felicitus

[Daid 306]

Most likely you are right with the burned plastic. You could try taking the head apart and add some more plumbing tape. But be careful with taking it apart, as it is easy to break, and it should be done while hot (making it harder)

[felicitus 0]

We cleaned the head, but now the Boden Cable keeps popping out due to jam. We have some thoughts about that:

- Temperature inconsistencies - the temperature of the extruder is too low, causing the filament not going through it perfectly.

- The black stuff came out from the very beginning, could it be due to an assembly error?

We have a second hot end, which we'll install to see if it makes any difference. However, is there any chance to calibrate the hot end?

[Daid 306]

Actually, the jam happens because the bowden tube moves up. The white+blue clip does not always seem to hold the tube in place. A printable solution is:

http://www.thingiverse.com/thing:11864

See: