Voronoi a solid object - Looking for tutorials

I saw an object on thingiverse and i am interested in making objects using the VORONOI "mesh"

Is there a simple program or add on i can use on my Part files or (STL file)

I downloaded a shareware called Blender and im totally lost in the complexity of that software and im sure it can do many other things as well.

All i want to do is voronoi mesh my part and then 3d print it

Thanks for any advice or suggestion where to look