Three-dimensional printing method

A three-dimensional printing method, adapted to control a fusion nozzle for heating a molding material and performing a three-dimensional printing operation, wherein the three-dimensional printing method comprises:

• determining a heating temperature of the fusion nozzle according to slicing contour information of a slicing object in a slicing image;
• and
• controlling the fusion nozzle to heat the molding material at the heating temperature, and controlling the fusion nozzle to perform the three-dimensional printing operation according to the slicing image,
• wherein the slicing contour information is an outermost-ring contour perimeter of the slicing object,
• wherein the step of determining the heating temperature of the fusion nozzle according to the slicing contour information of the slicing object in the slicing image comprises:
• setting the heating temperature as a first temperature value when determining that the outermost-ring contour perimeter of the slicing object in the slicing image is greater than a first threshold, and for the outermost-ring contour perimeter of the slicing object greater than the first threshold, the heating temperature is kept constant at the first temperature value,
• setting the heating temperature as a second temperature value when determining that the outermost-ring contour perimeter of the slicing object in the slicing image is less than or equal to a second threshold, wherein the first threshold is greater than the second threshold, and the first temperature value is greater than the second temperature value, and for the outermost-ring contour perimeter of the slicing object in the slicing image is less than or equal to the second threshold, the heating temperature is kept constant at the second temperature value, and
• setting the heating temperature according to a linear relation between the heating temperature and the outermost-ring contour perimeter when the outermost-ring contour perimeter is less than or equal to the first threshold and greater than the second threshold.