Abstract: In order to improve the efficiency of stratification based on the required accuracy, the
thought of uniform thickness layering is put forward on different assembly functions of STL model of
assembly requirement. The new algorithm divides the model into different parts along the molding
direction, and equally layers the parts based on different thicknesses. The sort of streamline method is
used to the uniform thickness layering algorithm of each section. The triangles which intersect with
stratification plane are directly extracted through the three sorting of the model, and then
stratification plane contour is output after quick intersection. The new algorithm is realized by
MATLAB software. A tooth with closed cavity is used as an example for verifying it. The results
show that the new algorithm has high flexibility, the required accuracy of component in function and
assembly is satisfied, and the section contours are quickly output.

Key words: rapid prototyping, STL, segmentation layering, sequencing, MATLAB