Hm, the output from net-print/poster-0.1 is not usable as the layer above with the cutmarks doesn't appear to be transparent. Instead the poster-20050907 from printing.kde.org works well for me. This poster version is based on the original CTAN one, but has more features, i.e. allows you to select pages. Please include that one instead. But don't include the poster-20060221 from printing.kde.org. It has a bug itself and produces PostScript errors. (See kde bug 132916) Thank you.
Created attachment 95061 [details] net-print/poster/poster-20050907.ebuild The KDE edition of poster (the one with tile selection support)
thanks, I added it.