Composite release films, and devices and methods using composite release film in field of additive manufacturing

A device for photocuring three-dimensional (3D) printing, comprising:

• a resin tank, configured to contain raw materials for printing including photocurable liquid resin, a bottom surface of the resin tank being transparent;
• a composite release film placed on a bottom portion of the resin tank, configured to separate a current cured layer from a photocuring surface, the composite release film including a plastic layer and an elastic layer, wherein an upper surface of the plastic layer is the photocuring surface that is a contact surface with the liquid resin, a lower surface of the plastic layer fits with an upper surface of the elastic layer;
• an elastic modulus of a material of the plastic layer is larger than an elastic modulus of a material of the elastic layer material;
• and a ratio of a difference between the elastic modulus of the material of the plastic layer and the elastic modulus of the material of the elastic layer to the elastic modulus of the material of the elastic layer is not larger than 20%;
• a build platform, a space between the build platform and the upper surface of the plastic layer of the composite release film being a printing region;
• and
• a light source, configured to irradiate the liquid resin in the printing region to provide energy to form the current cured layer.