Since opacity of SLS processed parts are derived from random reflection and refraction at
boundaries of refractive indices between the air and plastic, infiltration of resin that shares the
same index with the plastic can increase transparency of the parts. In this paper, desirable
characteristics for the infiltrant were investigated first, and transparentization test of SLS
processed parts out of CastFormTM was carried out. The highest transmittance of 80% and the
lowest haze of 55% were obtained. However, exact match of refractive indices of powder for SLS
and infiltrant did not give the best transparency. The reasons were considered in discussions.Mechanical Engineerin