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How to polar pattern a revolved surface?
(sh.itjust.works)
Your own 3D parametric modeler.
FreeCAD is an open-source parametric 3D modeler made primarily to design real-life objects of any size. Parametric modeling allows you to easily modify your design by going back into your model history and changing its parameters.
I think you'd be better off using the Boolean XOR tool from the same Split submenu (if you approach it from the Part menubar in the Part workbench), on your cube and your array, instead of the Slice apart tool.
Then on the resultant XOR object use the Explode compound tool from the Compound submenu.
You'll get a folder with all your sliced parts in it.