Hello everyone

I don't know where would be the perfect place for this post, but I really need help.. so I am posting this on both the CAM and CAD forums. Please forgive.

The question is: which software could I use to be able to trim .stl files with a cutting plane/surface, or to do booleans on .stl meshes?

I have two files to work on, both are .stl and both are too big to be cut on my machinery at once, so I need to cut them in parts.
I tried Meshcad for Rhino but it doesn't seem to work always...

many thanks for any suggestion!

Andrea
Torino, Italy