STL, abbreviation for stereolithrography, is an interchangeable file format that represents 3-dimensional surface geometry. The file format finds its usage in several fields such as rapid prototyping, 3D printing and computer-aided manufacturing. It represents a surface as a series of small triangles, known as facets, where each facet is described by a perpendicular direction and three points representing the vertices of the triangle.
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Additive manufacturing file format (AMF) defines open standards for objects description in order to be utilized by additive manufacturing processes such as 3D printing. CAD programs use the AMF file format by making use of the information such as geometry, color and material of the objects. AMF is different than STL format as the lateral does not support color, materials, lattices, and constellations.
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