According to the shape of the RP system, each making a certain thickness and shape of cross section, and then layered them bond together, it has been required to manufacture stereo parts. Of course, the whole process is under the control of the computer, done automatically by the rapid prototyping system. RP systems manufactured by different companies using different materials, system works is slightly different, but the principle is the same, that is, "layered manufacturing, layer-by-layer overlay". This process can be called the image "growth" or "additive".
Each section of the data comparable to a CT image; the entire manufacturing process can be likened to a "point" in the process.
RP technology of principle is: will computer within of three dimensional data model for layered slice get the layer section of profile data, computer accordingly information control laser (or nozzle) has selective to sintering a layer received a layer of powder material (or curing a layer and a layer of liquid photosensitive resin, or cutting a layer and a layer of tablets-like material, or Jet a layer and a layer of hot melt material or adhesive) formed series has a tiny thickness of of tablets-like entity, again used melt knot, and aggregate, and Bonding means making it stacked into one layer by layer, you can create design prototypes of new products, models, or die. United States 3D since the first commercial SLA rapid prototyping machine was launched in 1988, has more than 10 different forming systems, the more mature the UV, SLA, SLS, FDM and LOM and other methods.