cupsFilter (?) help

[Ray Spence]

Hi,

Apologies if this has been answered already. I've looked.

I have an HP4350 that will not print simplex, even when explicitly told to
do so, if this HP4350 is set to duplex by default. This odd behavior seems
associated with using the "HP Laserjet 4350 Postscript (recommended) (en)"
driver as configured in CUPS. I've fixed this duplex-only issue by switching to
the foomatic "HP Laserjet 4350 Foomatic/hpijs, hpijs 2.8.2.10 - HPLIP 2.8.2 (en)"
driver. So, now with foomatic, I can print simplex when requested. The problem now is that our existing local filter
*cupsFilter: "application/postscript /usr/local/foobar"
is totally ignored. This custom filter worked with the Postscript driver just fine. I'm nowhere near being an expert on the CUPS filtering process. Can someone please direct me to a solution here? Do I create a "local" types or conv file?

Thanks,
Ray