It should be noted that for all 3D printing technologies,typically there is no need of masks,molds, or dies to fabricate 3D objects.However,all 3D printing technologies need a 3D CAD(computer-aided design) model which is exported to the printer in a .STL (STereoLithography or Standard Triangle Language or Standard Tessellation Language) file format,that contains the coordinates of thevertices of
triangulated
sections
for each surface of the 3D model. The.STL file containing the 3D information can then be interpreted and converted by the printer slicer software into a G-code (numericalcontrol programming language) file,which contains information on 2D horizontal cross-sections for printing 3D replicas of the input 3D CAD model in a layer-by-layer fashion. The resolution of the 3D printed objects can be varied through controlling the number of triangulated sections;higher the number of triangulated sections,higher is the resolution