CNC Laser Gantry Wheel

This has been updated (6/17/17) to better fit the 20/40 rail. this wheel is for a 695 bearing and is for v-slot 20/40 rail and will work with this setup. http://www.thingiverse.com/thing:819755 and here are the directions to make the laser engraver. http://www.instructables.com/id/Laser-Engraver-With-Arduino-1/