Photo-curing 3D printer and 3D printing method

A 3D printing method comprising:

• accommodating, by a storage unit, liquid photosensitive resin;
• displaying, by an LCD display unit, a cross-section pattern of an object to be printed;
• providing a semipermeable membrane with an area matching to that of the LCD display unit above the LCD display unit so as to form a cavity therebetween;
• irradiating, by a light source which is capable of emitting light rays with a wavelength in a range selected from 420 nm to 430 nm or from 445 nm to 455 nm, the LCD display unit, the light rays irradiating the liquid photosensitive resin accommodated in the storage unit by first passing through the storage unit and then the LCD display unit so as to make the same cured with a shape corresponding to the cross-section pattern of the object to be printed;
• and
• at the same time of executing the step of irradiating, inflating, by an inflation unit, gas containing oxygen molecules into the cavity.

A 3D printing method comprising:

• accommodating, by a storage unit, liquid photosensitive resin;
• displaying, by an LCD display unit, a cross-section pattern of an object to be printed;
• providing a semipermeable membrane with an area matching to that of the LCD display unit above the LCD display unit so as to form a cavity therebetween;
• irradiating, by a light source which is capable of emitting light rays with a wavelength in a range selected from 420 nm to 430 nm or from 445 nm to 455 nm, the LCD display unit, the light rays irradiating the liquid photosensitive resin accommodated in the storage unit by first passing through the storage unit and then the LCD display unit so as to make the same cured with a shape corresponding to the cross-section pattern of the object to be printed on a bearing unit;
• at the same time of executing the step of irradiating, inflating, by an inflation unit, gas containing oxygen molecules into the cavity;
• turning off the light source and controlling, by a control unit, the bearing unit to move to a predetermined location;
• and
• repeating steps displaying, providing, irradiating, inflating and turning off the light source until a complete printed object is formed.