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Standard Handbook for Mechanical Engineers

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The RP process begins when the object is drawn on the screen of a CAD workstation or personal computer to provide the digital data base. Then, in a post-design data processing step, computer software slices the object mathematically into a finite number of horizontal layers in generating an STL (Solid Transfer Language) file. The thickness of the “slices” can range from 0.0025 to 0.5 in. (0.06 to 13 mm) depending on the RP process selected. The STL file is then converted to a file that is compati- ble with the specific 3D “printer” or processor that will construct the model. The digitized data then guides a laser, X-Y table,.