Abstract: A 3D printer includes a frame, a carrier, a nozzle and a detection device. The carrier is fixed to the frame. The nozzle is movably disposed on the frame. The detection device includes a piezoelectric ceramic sheet and a position detector. The piezoelectric ceramic sheet is in contact with the carrier. The position detector is disposed on the nozzle.

Abstract: A light-curing 3D printer includes a base, a display panel, a tank, a printing main body and a vibration detector. The display panel is disposed on the base. The tank is disposed on the base and corresponds to the display panel, and the tank is configured to store a printing material. The printing main body corresponds to the tank and the display panel and configured to perform 3D printing with the printing material in the tank. The vibration detector is disposed in the base and includes a piezoelectric ceramic sheet and a vibration transmission plate. The piezoelectric ceramic sheet is disposed on the vibration transmission plate, and the vibration transmission plate is in contact with the display panel.

Abstract: A 3D model file storage method comprises executed by a computing device: obtaining a 3D model file, wherein the 3D model file comprises a plurality of polygon meshes; slicing the 3D model file along a specific direction to sequentially obtain a plurality of 2D profiles, wherein each of the plurality of 2D profiles comprises a plurality of polygons corresponding to the plurality of polygon meshes; generating a plurality of difference profiles respectively corresponding to the plurality of 2D profiles according to the plurality of 2D profiles and a logical exclusive or (XOR) operation; and storing the plurality of difference profiles sequentially along the specific direction.

Abstract: An illumination module includes a light emitting unit, an optical lens with positive refractive power, and a concave mirror. At least one of an object-side surface and an image-side surface of the optical lens is an asymmetrical surface, and the light emitting unit is provided at an object side of the optical lens. The concave mirror is provided at an image side of the optical lens, and the concave mirror acts as an optical path folding element. Light emitted by the light emitting unit passes through the optical lens and is reflected by the concave mirror to be a parallel light ray.

Abstract: An illumination module includes a light emitting unit, an optical lens with positive refractive power, and a concave mirror. At least one of an object-side surface and an image-side surface of the optical lens is a free-form surface, and the light emitting unit is provided at an object side of the optical lens. The concave mirror is provided at an image side of the optical lens, and the concave mirror acts as an optical path folding element. Light emitted by the light emitting unit passes through the optical lens and is reflected by the concave mirror to be a parallel light ray.