Let's take a look at the most common issue that can affect the printing of the first few layers: an unleveled build platform. The following are some very important reasons to keep your build platform leveled:
To keep a print adhered to the build plate. A level bed will allow an even first layer to be applied.
To keep the first print layers from becoming distorted. In areas where the distance is too far from the nozzle tip, filament layers will be weak. In areas where the nozzle tip is pressed against the build surface, the filament will be squished too thin.
To reduce the risk of an extruder jam. If an area of the build plate is too tight against the hot end nozzle, internal pressure can build within the hot end and cause stripping of the filament at the extruder.
To reduce the warping of the print. In areas where the nozzle tip is spaced too far from the build plate, the poor adhesion of the filament layer will be prone to warping.
The following recipe will demonstrate...