Laser Cutter
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Overview
A laser cutter enables CNC cutting and engraving of metal, wood, and other materials.
Lasersaur
lasersaur from stefanix on Vimeo.
An open-source, digitally-controlled laser cutter is in development by Lasersaur.
Research
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
Self-replicating, cheap, CNC laser.
Some more self build or repaired laser cutters on BuildLog.Net
See also