specifying printer to gnus

[allan gottlieb]

I have two printers on my system.
  ss is a color deskjet connected via the lan
  lj is a b/w laserjet directly connected via usb

I want to print on lj by default.
I set the PRINTER env variable to lj in .bash_profile

When I execute gnus-summary-pipe-output (via | in Summary)
the article (mail message) is printed on lj

When I execute gnus-mime-pipe-part (via | in Article)
the attachment is printed on lj

However, when I execute ajg-gnus-summary-print-article-maybe-bw
(via AP in Summary) the article is printed on ss.

This suggests my ajg-gnus-summary-print-article-maybe-bw is at fault,
but here is the entire function

(defun ajg-gnus-summary-print-article-maybe-bw ()
  "Print with `gnus-summary-print-article' possibly in black&white."
  (interactive)
  (let ((ps-print-color-p ajg-color-printer-p))
    (call-interactively 'gnus-summary-print-article)))

I don't see where the printer is being set to ss.
Any hints?

thanks in advance,
allan