Heljee

Hi! I was just wondering why almost everything I print are approximately 0.4 mm to small in x and y direction (not in z direction)? This applies both for holes/circles and squared objects. Example: I want to print a rectangular object 40x60 mm, with a hole in the middle, 20 mm diameter. The results will be approximately 39,6x59,6 mm, with a diameter of 19,6 mm. Also, the nozzle size is 0,4 mm, which is the size that are missing in all directions (except z direction). It feels like the printer is skipping one line/path. Or could this be because of shrinkage? Is it possible that PLA plastic is always shrinking approximately 0.4 mm, no matter how large the object/feature is?