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Tools of the trade / 'Permission Denied error' workaround
Just want to thank everyone who's put their hard work into this amazing tool! I thought I'd add my small discovery after trying all day to get everything working on a Mac (10.6.8).
I got all the files and dependencies installed following the excellent instructions at adamfeuer(dot)com (I can't post the full link,as it apparently looks "too spamy for a new user"). Using Jesus' GUI (g2g_gui.py) I got the Graphtec files made ok, but then got stumped trying to output to the Silhouette (Portrait in my case).
Kept getting 'Permission Denied' messages when trying to send the file to the cutter. Eventually found good info here on CUPS command line printing options at cups(dot)org (documentation/options). Using the Graphtec file I'd already made, I could print through the Terminal command line with: lp -o raw filename.txt (replace filename.txt with your Graphtec file).
That did the trick and printed out a great stencil. Hope that helps anyone stuck in the same situation. Thanks again to everyone who put the real work into this program!