Cut some 2 inch steel tubing today.
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Show off! 
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As big and bad as it is, plastic stops it like Kryptonite. We have to pre-burn the thin protective plastic film off of metal before cutting or it won’t cut the metal. Even a plastic or paper label on the back side of metal might cause it not to completely cut the metal.
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Wow, That surprises me. 
Took some googling but the prices seems to start around 20k 
, for a borring flat one too.
Very cool