Laser Cutter
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An open-source, digitally-controlled laser cutter is in development by Lasersaur.
There are instructions for a homemade laser cutter here.
http://www.instructables.com/id/CO2-laser-that-cuts-sheet-metal/ - CNC laser cutter for metal. There is evidence that by using laser engraver tubes ($200 each), say 10 of them, an industrial power laser can be put together at reasonable cost. The challenge is to work out the optics for paralleling the beams
This one looks interesting - http://eng-serve.net/buildlog/cnc_laser/index.php?pg=152&dir=desc. Meant to be a partly self-replicating, cheap, CNC laser.
Some more self build or repaired laser cutters on BuildLog.Net
See also