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You may find this thread of interest... https://forum.bricsys.com/discussion/14274/how-to-print-or-plot ...
A little bit lost there myself, creating default.pc3 seems not possible, as described. What works is creating pdf's and printing them. Is that standard procedure? I.e. piping PDF output to a printer device? Nicely described here.
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Continued here: https://forum.bricsys.com/discussion/35143/understanding-the-printing-process