the other alternative is to use makerware.
works quite well and is better than simplify3d for dual colour/material prints.

Simplify 3d is much better for everything else. makerware is free - so buy simplify3d and have the best of all worlds :-)

The other thing you can try is the klick-n-print gcode convertor: http://knp3d.com/software/#knp3dconverter