well my idea would be to take the stl. install the latest version of blender for free ! and split up the model into a few different bodies and then export them individually out as stl.. job solved.
blender is a little different to other programs but there is so much stuff on youtube to help you do exactly this. it should be a piece of cake !
This is what i found on the web:
I don't remember what software but i believe that netfabb pro isn't the only one to do this
I believe Cura is able to do this too?
Or maybe not
Maybe take a look at:
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