/etc/cups/ppd/Epson-WP-4530.ppd.orig: *cupsFilter:            "application/vnd.cups-raster 0 /opt/epson-inkjet-printer-escpr/cups/lib/filter/epson-escpr-wrapper"

so, my problem was a munged path in this file, instead of a coherent path, the middle of the /opt/epson-.../path corrupted.
fixed the path, restarted cups and voila.

did you try making cups logging more verbose?

On Sat, Mar 9, 2019 at 5:15 PM ToddAndMargo via users <users@lists.fedoraproject.org> wrote:
On 3/9/19 4:49 PM, Jack Craig wrote:
> this may be foolish, but have you swapped out cable & printer to rule 
> them  out?

Hi Jack,

I booted of a Flash a drive I have Fedora 29 installed on.  The
printer printed perfectly over lp0.

Then whilst still being booted into the flash drive, I did
my updates, which I had ignored for a long time.  After
that the flash drive would not print either and with the same
symptom.

And yes, before that, I did check the cables.  They
were attached very securely.  Life should be so easy.

And the printer does print off its USB interface, but it is one
of those old printers where the USB was done really poorly
and it can get through printing an single invoice.  And
I need to get my billing out so as I can put food on the table.

Something is buggering up lp0.  I doubt it is CUPS either.

-T

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