The printing methods of solder paste can be divided into contact and non-contact printing. The printing with a gap between the stencil and the printed board is called non-contact printing. When the machine is set, this distance can be adjusted. The general gap is 0-1.27mm. while the printing method of solder paste printing without printing gap (that is zero gap) is called contact printing. The vertical lifting of the screen plate of contact printing can minimize the impact on printing quality. It is very suitable for fine and difficult printing.