Direct slicing of CAD models for rapid prototyping

Abstract

The 3D Systems stereolithography file format is a good workhorse for the rapid prototyping (RP) industry. It is supported by all major computer‐aided design (CAD) and RP manufacturers and there now exists a selection of third‐party software which supports this de facto standard and helps to make it work better. However, input to RP systems is sometimes best suited to the format of sliced contours. These may be produced from a three‐dimensional CAD model or via reverse engineering techniques such as laser scans and co‐ordinate measuring machines. Other sources include computed tomography and magnetic resonance imaging scans. Takes a brief look at both of the above methods, listing their advantages and disadvantages. Identifies several ways in which sliced data can be used to drive RP processes. Finally, presents in detail a methodology used to develop a direct and adaptive slicer from a commercial CAD system.