New Russian-American startup EnduranceRobotics recently founded in January 2015 (specialises in telepresence robots) has created a device that allows almost any 3D printer (or CNC router) to be transformed into a laser cutter for only $195.
Their creation is a small laser attachment that with a bit of adjustment can be fitted onto the extruder of almost any 3D printer. The laser is compact and powerful and it the diode can be bought as 2.1 Watts or a 3.5 Watts.
The laser allows your machine to cut plywood, acrylic, leather, engrave metal, and cut other thin materials. the laser cuts to a depth of 3.175mm with a dot size of 0.25mm.