Hi seasonofchange,

> Is it possible to glue the pieces after the import process?

It is possible to do that by selecting surfaces and then using the Edit > Join command. But presumably there is some kind of situation in your geometry (most likely little slivery surface fragments) that the joiner is seeming to have difficulty handling. So there may be some particular area of the model that won't join properly.

You could try using STEP or SAT format instead - those formats transfer already joined solids so MoI does not generally have to figure out how to join a big bunch of surfaces up for those formats.

- Michael