Enhancement of Sliced Layer Contour for Reconstructing a 3d Model Using Solid Freeform Fabrication

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%.