If you have the PLA temperature too hot, the plastic will be too soft. You will especially notice the effects at the corners because the plastic stretches when it is hot. As it cools, it starts pulling against itself. And at the corner, there is nothing to equalize the tension. As a result, the corners start to lift up.
I print most of my PLA at 205 C. Sometimes, on a particular roll I will bump the temperature up or down a few degrees. But pretty much... I print PLA at 203 to 208 C. With most of it at 205 C.
I print most of my PLA at 205 C. Sometimes, on a particular roll I will bump the temperature up or down a few degrees. But pretty much... I print PLA at 203 to 208 C. With most of it at 205 C.