Fabtotum + Taulan nylon

Hello,

Could you please try to identify issues, why my printer is not extruding?

One of two (both were first) great prints: http://3dprintboard.com/attachment.p...tid=5581&stc=1
Printer - Fabtotum
Filament - Taulman Nylon 618
Extrusion temp - tried various, from 200 too 230 (mostly)
Heated bed - 60 + PVZ glass coat

Here are pictures of what happens (meaning, practically nothing, except from mild fumes from hot end) when trying to print Marvin sample file

http://3dprintboard.com/attachment.p...tid=5578&stc=1http://3dprintboard.com/attachment.p...tid=5579&stc=1

Extruder seems a bit black, but no filament seems to have came from it. Also, here is my last "partly sucesfull" print in PLAhttp://3dprintboard.com/attachment.p...tid=5580&stc=1

If you need more info or pictures, please specify

Thanks a lot :)