Real Cut 1D has no option to export to PDF.
However, one can install a PDF virtual printer (like PDF Creator) and use it for printing to PDF.
After installation of the virtual printer, one can export to PDF by pressing the Print button from Real Cut 1D and then choosing the virtual printer instead of a normal printer.
PDF Creator can be downloaded from https://www.pdfforge.org/pdfcreator. Other virtual printers can be used.
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