Quality of eSun PLA filament?

Hi,

I have run into horribly brittle parts of eSun PLA filament.

Layer separation on a printed part.
Layer height 0.2 mm, infill 40%, perimeter 3, temperature 210 C


I thought the red filament was a bad batch so I opened up a green filament.
Layer height 0.2 mm, infill 40%, perimeter 3, temperature 205 C


When I was removing the screw, it broke.

The cube's wall thickness is 0.8 mm without infill. The screw's diameter is 11.15.
I could break screw with finger pressure.
Simple math gives surface area of two objects: cube (25.60 mm^2), screw (103.86 mm^2)
The screw should have 4 times stronger than the hollow cube. To me the screw feels twenty times weaker than the cube.

Temperature cube test




Edited 2 time(s). Last edit at 10/03/2016 09:31PM by janpenguin.

Do prints with filament of different suppliers look the same, in other words is the problem just the strength?

I have a bunch of old esun spools laying around, abs though, i only tried one yet, and the quality is fine.

I'm using eSun PLA.

Don't buy their "PLA"
It is rubbish and brittle. As you noticed you can just twist the part and delaminate layers.

Get their "PLA+" which is stronger.

@Govahnato

It was bad filaments.

@Veesta

The third filament was okay. I sent two spools of filament to the seller in exchange of new ones.
If one of the filaments turns out bad, I will get other brand.

I made a simple cube to test new filament.
[www.thingiverse.com]