Something Wrong with my filament

[htbui 0]

Hi everybody, I just bought a new Ultimaker 2 Plus extended about a week ago. I love it a lot so far. However there is two problems that I have right now: (Sorry for my bad English)

Problem 1: It seems like there is a dis-uniform color in my Ultimaker Silver PLA filament. The color slightly shift after several layer.

Problem 2: There is several random mark/scratch on my print. You can look at the red circles on the image

I printed with the factory setting for temperature and

 

• Layer height of 0.1mm
  
• Speed at 40mm/s
  
• Infill of 20%
  
• Brim
  
• Enable Retraction
  
• Shell thickness of 1.2mm
  

 

Is there any way to fix the problem? or any suggest on changing the setting in Cura?

Thank you for your time

[JohnFox 25]

Suspect it is where the outer layer stops and starts. The rest of the print looks pretty good.

[htbui 0]

Is there any ways I can reduce the visibility of the scratches

[JohnFox 25]

You need a Cura expert.

Is there any ways I can reduce the visibility of the scratches