Hello, I'm fairly new to 3d printing, I've got an Hephestos 2 printer and using a PLA filament.
I've been having problems with the top layer of my prints, the bottom and sides are okay if not perfect
but the top comes out very dirty looking
i've tried re-calibraiting the printer, aligning the bed height, using different brand filaments & also cleaning the nozzle.
attached are pics of the print and settings... any thoughts about what might be causing this?

Thank you very much for your help Michal
IMG-20161008-WA0011.jpgIMG-20161008-WA0006.jpgIMG-20161008-WA0005.jpgIMG-20161008-WA0010.jpgIMG-20161008-WA0007.jpg