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3D printing, or additive manufacturing, is the construction of a three-dimensional object from a CAD model or a digital 3D model. [1] [2] [3] It can be done in a variety of processes in which material is deposited, joined or solidified under computer control, [4] with the material being added together (such as plastics, liquids or powder grains being fused), typically layer by layer.
A print head similar to the one found in a 2D inkjet printer then applies the binder to the layer to solidify and bind it to the previous one. [2] Although binder jetting does not allow for multi-material support, there exist printers, which feature a second print head to apply pigment to the layer after the binder to allow for full color prints.
Large 3D printers have been developed for industrial, education, and demonstrative uses. A large delta-style 3D printer was built in 2014 by SeeMeCNC. The printer is capable of making an object with diameter of up to 4 feet (1.2 m) and up to 10 feet (3.0 m) in height.
As the material is generated layer by layer the tray is gradually lifted and the photo inhibitors will not allow adhesion near the window. [13] Rapid, large-volume, thermally controlled 3D printing, using a mobile liquid interface. Another way to address the adhesion problem is to create a dead layer which prohibits the curing process.
The printing process begins when a layer of sand, 5 to 10 mm thick, mixed with solid magnesium oxide (MgO), [6] is evenly distributed by the printer head in the area enclosed by the frame. 3-D printing software slices the 3-D model into 2-D layers for printing.
The height of the print head is the height of the nozzle relative to the printing platform. This parameter affects the surface quality between layers including bond strength, and must be precisely adjusted. A print head that is set too high will reduce the bond strength between layers, causing an unstable shape. [8]
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