Step 8: Done!
The laser reaches 150ft if you focus it well and it is about 5$ in materials and made by yourself!
If you liked my instuctable, please, vote me in the Epilog laser, pocket-sized electronics and battery powerwed contests.
If i win the laser cutter, thing that probably will not happen, I'll use it for engraving everithing i can, for cutting gears, cases, 123D kits... It would be totally awsome!
Feel free to ask me anything you didn't understand or propose upgrades.