need help on castable 3d model

i have a model that need to be converted in to solid
castable model via 3d printer.

this is the work i am doing for a client and he
asked me to give a volume in the model .

so...anyone here who know how to convert 3d model into
castable model.

Thanx

I'm no expert in printing 3d models but from what I know the model should be in .STL format to be understood by 3d printers.

In 3dsmax there is a modifier that checks the 3d model for STL errors.