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286. Working of Rapid Prototyping Machines

CAD software and the rapid prototyping machine are connected with a data interface that is called as the STL file format. This STL file format enables the approximation of a shape of a part or the entire assembly using triangular facets. Smaller the facet, higher is the quality surface. One should consider the meaning of the word rapid as 'relative', as the construction process of a model with the contemporary methods can take up a long time which can be several hours to several days. It actually depends upon the complexity and size of the model. The method used over here also plays an important role. Sometimes the type of machine being used also influences the time taken for the creation of a new model though the additive systems are applied. Even here the size and the number of models to be created play an equally important role.

There are some other techniques that are used in the construction of parts. The technique used in solid freeform fabrication involves the use of two materials in the construction of parts. One of it is the building material of that part and the other is the support material. The use of support material is to provide support to the projecting features during construction.

In case of manufacturing polymer products in higher quantities, a process called traditional injection molding is more feasible in terms of cost, but when it comes to manufacturing parts in smaller volumes, the application of additive fabrication is recommended more and is cost effective.