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Fig 2.1 Procedure of Rapid prototyping<br />
The process of deposition of the material may be in either solid, liquid or powder<br />
form. In case of a FDM process, the tool head will move and deposit the material as<br />
per the co-ordinates stored in the STL file. In case of a SLS process, powders are<br />
gradually sintered to form layers and photo sensitive epoxy resins are cured in a SLA<br />
process to form layers one on top of other. Any support structure is first removed<br />
after the model has been printed. The methods of this removal may vary on the<br />
process and the model created.<br />
2.1.1 Modelling<br />
Developing the CAD model is one on the first steps in any type of rapid prototyping<br />
process. A branch of computational geometry known as computer aided geometric<br />
design which is used in the development of virtual models. The first kind of models<br />
made in earlier days was the two dimensional geometric models which are basically<br />
two dimensional figures of objects which were fairly simple in nature. Flat objects<br />
could be easily represented with two dimensional models but its applications were<br />
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