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I was engraving just fine on tumblers while hooked to the RA2, and my GFCI shut my studio down.  After I got everything back up and running my F1 will no longer engrave on tumblers.  There is no laser coming out at all.  I can engrave on all other materials that do not need the RA2, but it won't work with the RA2 attachment.  The RA2 even spins like it's engraving, but nothing.