There's not really a drop-in solution for what you're looking to do, at least with an Airwolf printer. Lasers are complex machines, and can be dangerous if not properly designed and built. For this reason, you'll probably not want to try anything with a laser on an existing 3D printer, but rather build a machine that's meant for laser cutting, like the Lasersaur: http://www.lasersaur.com/
Another project that is good as a 3D printer or CNC is the Mostly Printed CNC, which uses a Rotary Tool as the tool head to cut or engrave: https://www.vicious1.com/assembly/
Hope that helps.