the sketch up method is also work, took time to find the correct plugin. but so far with sketch up, i can only slice it up to 20-30 slices without crashing the software. with 123D, i can slice up to 200 part, but the software will be busy for 5 minute.
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Some other alternative,
Pretty good in slicing, with .stl input and .bmp output.
Input file is .stl, but still figuring out how slice the .stl file (because it's recognized as model, solid model)
Using POV-Ray. have not try it yet.