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In appbrowser there is gutenprint that is compatible only with cups 1311
D [23/Oct/2011:10:30:54 +0000] Print-Job client-error-document-format-not-supported: Unsupported format 'application/vnd.cups-banner'!E [23/Oct/2011:10:30:54 +0000] Returning IPP client-error-document-format-not-supported for Print-Job (ipp://localhost:631/printers/EPSON_Stylus_SX100) from localhost
The cups1311.tcz extension lists gs.tcz as a dependency while cups.tcz does not.