ABSTRACT
Nowadays, Solid Freeform Fabrication (SFF) takes a great attention by creating
complex solid objects directly from geometric models without specific tooling
information. SFF also referred to layered manufacturing (LM) which builds up 3D
objects by successive 2D layer deposition after exporting it as an STL file format from
its CAD environment.
This paper aims at overcoming the approximation problem of 2D layer contour from
sliced STL model. The author used a Lagrange interpolation method to increase the
point's coordinates of the sliced layer contour in order to reconstruct an accurate and
near net contour of the original sliced CAD model. This method reduced the error
between the original sliced CAD model and the actual reconstructed layer contours to
0.006%.