Seems you can use the free FormZFree! ;)
http://www.formz.com/products/formzfree.html



or inside the Free SketchuP 2017 Make + free TopoShaper by Fredo
https://www.sketchup.com/download/all#fr
https://sketchucation.com/forums/viewtopic.php?f=323&t=52039

Hi,

afaik there is no such script available. Do you have contour lines
which you import into MoI? If so, how should a script then detect
which lines form a hill or valley?

Nevermind, i re-read your post...

If i remember correctly one of the free Autodesk Tools can
convert a mesh model into sliced pieces, so that it looks
like picture d.

Regards
Stefan

Just checked it, it is Autodesk 123D Make.

it exports then the sliced (triangulated) model
as .stl or .obj.

Regards
Stefan

Hi Chris, sorry I don't know of any script to do that in MoI.

- Michael

Thanks to everybody! I'll look into the external options