3D printer, also known as three-dimensional printer, is a kind of cumulative manufacturing technology, that is, a kind of machine of rapid prototyping technology. It is based on a digital model file and uses special wax, powdered metal or plastic and other bondable materials. Print layers of adhesive material to create three-dimensional objects. 3D printing does not require machining or molds, and can directly generate objects of any shape from computer graphics data, which greatly shortens the production cycle of products and improves productivity.
3D printing, like laser forming technology, uses layered processing and overlay molding to complete 3D solid printing. The printing process of each layer is divided into two steps. First, spray a layer of special glue on the area that needs to be formed. The glue droplets themselves are small and difficult to spread. Then spray a uniform layer of powder, the powder will quickly solidify and bond when it meets the glue, while the area without glue remains loose. In this way, under the alternate layer of glue and layer of powder, the solid model will be "printed" and formed. After printing, the model can be "planed out" by sweeping away the loose powder, and the remaining powder can be recycled.
