White PLA - Intermittent Underextrusion?

[wirlybird]

I have been fighting this one for some time. Using white PLA, eSun brand, I constantly get these areas of what appears to be under extruded lines. See where the red arrows are in picture. It is a bit hard to see in the picture but at these spots you can see the layer below.

Now, this is not printer specific. This example is on a Guider II.
I get the same results on different printers. It does appear to be mainly on flat surfaces. Other colors print fine.

Basic settings I have tried:
Nozzle - 0.4
Extrusion Multiplier - 0.9 - 1.0
Extrusion Width - 0.4 - 0.48
Speeds 35-40 mm/s
Temps 210-220
Basic retraction - 1mm at 30 mm/s

I have found the filament diameter to be vary inconsistent being as small as 1.65 up to 1.74.

It looks like it has times where the extrusion sort of stops or at least slows to leave a very thin extrusion.

I am not printing that fast but could it still be too fast?
It acts like when it gets to the thinner parts of the filament the extruder may be slipping a little slowing the extrusion.

Thanks for any thoughts or ideas I can try. I would even consider an upgrade/modified extruder drive assembly.

[airscapes]

sounds like you have diagnosed the issue, toss out that roll and get another.. Send Esun support an email, they may send you another roll. If you printer allows you to adjust the filament drive tension.. not sure what type printer you are using, try to a bit more tension to avoid the slipping. Also change the filament size on the other tab to be an average of the thickness. You may need change the Extrusion multiplayer a bit after adjusting filament thickness.. of course if your drive is slipping the software change will not help. Sometimes it best to just get another roll of plastic.
Good luck!

[wirlybird]

It is every spool of eSun white that is like this. They claim there is no issue and won't do anything.

I have already run the size to1.65 in S3D and extrusion multiplier to 1.0

Printer is a Guider II, basically the same setup as a Creator Pro as far as the drive goes. Sprint loaded tensioner.

Just hoping for some creative ideas! Thanks!

[airscapes]

Makergear white PLA is very consistent. It is a re-branded USA made product but a bit more expensive, but I did not have any consistency issues.
https://www.makergear.com/products/pla

I have also used MakerGeeks PLA which is OK but also has consistency issues.

Unfortunately I think this is one area get what you pay for.. then again.. maybe not.

[wirlybird]

Most white seems to be somewhat problematic. eSun isn't the cheapest either but usually most colors are very good.

Just got some Amazon white to try out.