Mark points on the SMT stencil are used by the full-automatic printing machine for PCB reference calibration before printing each PCB, so it is unnecessary to make Mark points on the semi-automatic printing stencil;

Mark points must be made for the full-automatic printing machine. As for which side of the stencil is placed, it depends on the specific structure of the printing machine (the position of the camera). Generally, Mark points are not engraved thoroughly, or black glue is sealed after being engraved thoroughly.