The F400-S has an automatic bed leveling process to ensure that on a day-to-day, basis the bed is level and you will get a great first layer, which is integral to the printer’s performance. About once a month, you may manually check the bed to ensure that the corners of the bed are at the same level as the center of the bed. This process is very easy and can be done using the supplied feeler gauge and the thumbscrews below each corner of the print bed.