Common 3D printing problems: holes and bumps on the top surface (pillowing).
Some tips to solve out pillowing: holes and bumps on 3d print top layers.
Even if it seems to have prepared the perfect G-code, suddenly holes, bumps and top surfaces, which are not completely closed, may appear when arriving to top layers… What happened?
Don’t panic! This is a common problem when using 3d printers, it’s called “pillowing” and it can be easily solved out with some extra care.