3D Printing Method, Forming Mechanism And Printing Device

A three dimensional (3D) printing method, comprising:

• providing a forming mechanism comprising an accommodation cavity, a light-transmitting assembly, and a platform assembly, the accommodation cavity being prefilled with printing material, the light-transmitting assembly allowing light to pass through to cure the printing material, the platform assembly being movable away from or towards the light-transmitting assembly, the platform assembly comprising a forming platform, a forming cavity being formed between the forming platform and the light-transmitting assembly, and the accommodation cavity comprising the forming cavity;
• releasing the forming platform from the light-transmitting assembly, comprising:
• moving the forming platform away from the light-transmitting assembly by a preset distance, and increasing air pressure within the accommodation cavity to a first air pressure, wherein the first air pressure is greater than an ambient air pressure, and an air pressure difference between inside and outside the accommodation cavity pushes the forming platform to move away from the light-transmitting assembly, a driving mode for the forming platform comprises one or more of the following modes:
• pneumatic driving, mechanical driving, or a combination of the pneumatic driving and the mechanical driving;
• curing the printing material, comprising:
• moving the forming platform to a next printing position, and enabling the printing material to be cured by light on the forming platform and forming a printing layer;
• wherein, after releasing the forming platform, the method further comprises:
• reducing the air pressure within the accommodation cavity to a second air pressure, wherein the second air pressure is less than the first air pressure, and the second air pressure is greater than or equal to the ambient air pressure.