I. Introduction
Nowadays, rapid prototyping (RP) technology has been one of the rapid development manufacturing technology [1]. Using this method engineer can create complex three-dimensional shapes with simple and automatic manner, therefore, it has an epoch-making role in manufacture technology [2]. SLA (Stereo Lithography Apparatus) is an advanced manufacturing method of rapid prototyping that has been quickly developed and widely used in various fields. The great breakthrough is that it brings the fabrication approach from traditional removing material method (made by remove excess way) to increasing material method (formed by cumulative way) [3]. The more and more application in casting, mould and plastic industry of SLA has brought much convenient and short production cycle.