printing ABS with the E3D all metal hotend

So I just changed form the J-heads to the allmetal hotend with thermocuople. when printing ABS do you turn off the fans? I am left the heat sink fan on and then turned the filament cooling fan so it will blow away. I don't know if this is OK or not, or if the head will support no fan printing specially for 20+ hour prints.

While doing this I had some problems with my first and last layer. my last top layer has some rough spots as if the head came down a layer and moved over, it it not everywhere but in some areas. also there is some lines missing. it is probably the same with the bottom. I haven't had problems with the j heads, but i know it is a learning curve with this new e3d head.


any advise would be appreciated




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