Filament diameter


Is it normal and something I need to live with that blobs occure on the filament? 

(2.61mm diameter, see picture)

Found this after 3 hours printing, the extruder tried to pull it but could not. 



Never had that happen.. Been through about 10 spools now..

Strange... It should not happen and never happened to me. :huh:

Do you use enclosure?

As I know from my friend which have a big experience with materials, the black dye has high hygroscopicity and should be stored in an airtight container.