I recently started printing again and chanced upon some old PLA filament kept well, and here is what I found out.
The PLA is not as flexible, and has bubbles in them. They do not give popping sound like in ABS so I am not too sure if they are due to moisture. They also are to a great extent dependent on the print temperature.
Anybody has any idea what is going on?
Pictures from left to right: print temperatures 210, 200, 190, 180
Close up from 210, 200, 190, 180