A heuristic algorithm for slicing in the rapid freeze prototyping of sculptured bodies

Abstract

The subject of this paper is a heuristic slicing algorithm for converting STL or PLY CAD data into boundary and fill paths for rapid freeze prototyping (RFP). The algorithm, developed for one commercial robotic system, can also be used to produce toolpaths for other rapid prototyping systems. The algorithm entails five steps: (a) geometry data and other control parameters are imported; (b) the geometry is sliced at several equidistant heights to form bounding paths; (c) contours for the scaffolding material are computed; (d) part and scaffolding paths are buffered in or out to account for deposition path width; and (e) fill paths are computed. A STL file of a 300 mm-high statue of James McGill is used as an example part for demonstrating the capabilities of the algorithm. © 2010 Springer-Verlag Berlin Heidelberg.