;; (setq ps-font-info-database '(<your stuff> <the standard stuff>))
;; or, use `ps-print-hook' (see section Hooks):
;; (add-hook 'ps-print-hook
-;; '(lambda ()
+;; (lambda ()
;; (or (assq 'Helvetica ps-font-info-database)
;; (setq ps-font-info-database (append ...)))))
;;