Have you ever felt frustrated when you get some STL file that contains all the parts that you want to print, but they don't fit on your building plate? I usually split the file into separate pieces manually, with netfabb or tinkercad, but now I wrote a small script that does that for you, automatically!

Just get it here: https://github.com/fsantini/python-stlsplitter

You will, of course, need Python installed (with numpy), but otherwise you just need to do:

python stlSplitter.py <file.stl>

As a bonus feature, you also get a STL read/write library that can work both with binary and Ascii files!

Hope it helps!