Lately I'm having some issues with white PLA.
It sticks nicely to the print bed, but the very last layer of the print comes out really ugly.
I'm not a native english speaker, I don't know what is the proper term to describe what I see, so I'm attaching two pictures instead:
As you can see, the surface has wrinkles. If you touch it, it feels like a jaggled surface. What is causing this? I've never had this kind of issue before with the same PLA roll, what can be the issue?
I have a prusa-style printer, 45°C printbed, 225°C hotend, 10% hexagonal infill, 30mm/s print speed. The object stays on the surface without warping, I can tell for sure that it isn't detaching from the bed and coming up towards the extruder.
It happens only for infill, perimeters are just perfect.
What can be the issue here?