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1. A stereolithography (“STL”) model slicing method, comprising: reading and loading an STL model; obtaining a first slicing plane; horizontally cutting the STL model with the first slicing plane according to a first set thickness to obtain a first contour curve, the first contour curve being a contour curve of a section of the STL model obtained by the first slicing plane; judging whether the contour curve contains a solid part of the STL model; if the contour curve contains the solid part of the STL model, filling the solid part with white to obtain a white part; determining a non-solid part in the contour curve according to the solid part; filling the non-solid part with black to form a mask of the section; projecting the mask to liquid photosensitive resin by a first 3D printer, so as to cure the white part into a first cured contour; obtaining a first slice bitmap according to the first contour curve; judging whether the first slice bitmap conforms to a preset projection size; when the first slice bitmap exceeds the preset projection size, determining that a splicing mode is required for the first slice bitmap; uniformly splitting the first slice bitmap according to the splicing mode to obtain a series of unit bitmaps, the series of unit bitmaps comprising a first unit bitmap and a second unit bitmap; obtaining an overlapped part of the first unit bitmap and the second unit bitmap; judging whether overlapped pixels of the overlapped part have values of 0; and when the overlapped pixels of the overlapped part do not have values of 0, graying edge pixels of the first unit bitmap and the second unit bitmap to obtain unit bitmaps with sizes capable of being projected by the projection apparatus.
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