CUPS installs filters in /usr/lib/cups/filters, but it looks for them in PATH so no printing works until you do ln -s /usr/lib/cups/filters/* /usr/bin. Reproducible: Always Steps to Reproduce: 1. emerge cups 2. set up printer 3. try printing anything -- it gives an error Actual Results: See details. Expected Results: Printed something.
which version of cups? which gimp-print*?
i really don't think so ;) if this is still valid, post another comment on it.