Patent ID: 8666531

Claim:
A slicing method for a rapid prototyping apparatus with a printing module, comprising the following steps: (a) accessing data of plural cut points, which are generated from a slicing plane of an object intersecting with plural grids; (b) determining whether a printing module performs an achromatic color printing or not; (c) if yes, connecting two cut points to form a first slicing outline based on the data of the plural cut points, wherein the cut points are generated from the slicing plane intersecting with each grid; (d) checking whether a discontinuous plane exists in the first slicing outline or not, wherein if yes, the cut points are paired with a polar coordinate by determining a position of a polar axis based on a direction of a previous path in the polar coordinate, a connecting path is selected based on a smaller included angle made by the polar axis and the connecting path when the position of the polar axis is determined, and the first slicing outline connects with the connecting path to form a closed slicing outline to perform an achromatic inkjet printing in the closed slicing outline.