Device for 3D printing and control method thereof

A control method of a device for 3D printing, wherein the device for 3D printing comprises:

• a feeding pipe, wherein an opening extending along an axial direction of the feeding pipe is disposed on an outer wall of the feeding pipe;
• and
• a sleeve sleeved on the feeding pipe, wherein a discharge port in communication with the opening is disposed on an outer wall of the sleeve, the sleeve is capable of rotating around an axis of the feeding pipe relative to the feeding pipe;
• wherein a passage of the discharge port is a structure in which a section along material outflow direction gradually shrinks to a required size of the discharge port, the discharge port is a discharge port with a continuously adjustable size, and the discharge port performs a continuous printing along a cross-sectional contour line of a target printing region, and the outer wall of the sleeve comprises a first portion and a second portion, the first portion and the second portion are slidable relative to each other along the axial direction to adjust a length of the discharge port;
• wherein the control method comprises:
• controlling the sleeve to rotate around the axis of the feeding pipe relative to the feeding pipe, so as to make the discharge port and the opening communicated or no longer communicated.