New PETG spool from eSUN is making popping sound while extruding I just bought new eSUN PETg filament. When I started to extrude it, I heard popping sound same as moisture boiling out of it. I don't expect new eSUN vaccum sealed filament having moisture content. Is there any problem with my e3d v6? Is it possible that due to old filament, moisture is residing inside my extruder assembly and new filament is carrying it while extruding? 
My settings : 


print temperature: 250&nbsp;&deg;C, 
bed temperature: 80&nbsp;&deg;C, 
retraction length: 6.5&nbsp;mm, 
retraction speed: 25&nbsp;mm/s, 
print speed: 10&nbsp;mm/s, 
layer height: 25 micron


What do I do in this case? Should I clean the extruder assembly?
The extruder can't hold much water and transport it to the melt zone.  Filament can.  The printer behaves like the filament is wet, so try drying it.  

Try putting the filament in your electric oven at the lowest temperature (often 170&nbsp;&deg;F to 180&nbsp;&deg;F) for an hour and see if the behavior improves. 

Keep the filament at a distance from (or shield it from) the heating elements.