In the area without good adhesion, rotate the manual
leveling knob under the printing platform, adjust the
distance between the nozzle and the build plate, and
observe the printing until the extruded material can be
attached to the build plate. After printing for a long time,
use tweezers to clean the impurities on the nozzle. Change
the printing parameters, reduce the layer resolution of the
fifirst layer, increase the extrusion rate of the fifirst layer, and
reduce the printing speed of the fifirst layer.