What usually causes "STL Check" Modifier to crash?

[Anonymous]

I have a mesh with about 300K verts. It REALLY doesn't like working with ProBoolean or ProCutter so I'm pretty sure it's not watertight. When I run STL Check, the program just freezes forever. I will never get an error dialog no matter how long I wait. So I always have to manually end process.

However, STL Check works on a generic sphere.

I've tried exporting my 300K mesh to .obj, re-importing, and then using multires to reduce verts by 10% to see if that might get it to work but it still crashes 3ds Max.

Any suggestions on what might be causing STL Check to crash?

[leeminardi]

My approach would be to find the potential problem area(s) first.  I would start by perhaps subtracting a big box from 90% of one end of the model, convert the result to an editable poly then do the check.  Repeat the process using Boolean intersect on another 10% of the model.  Repeat as necessary to learn more where potential "leaks" may be.

[Anonymous]

Your suggestion worked! Even just splitting the mesh in half was enough to make both sides STL-checkable.