OpenBuilds - DIY build of a Co2 Laser cutter/engraver 12x24 working area. This build displays great instruction on how this laser cutter/engraver was developed. Make sure to check out the build here:
OpenBuilds Acro-System Laser Upgrade - low cost laser head
Openbuilds CO2 Laser Rail System for K40 | 3D Warehouse
OpenBuilds ACRO laser engraver | 3D CAD Model Library | GrabCAD