+(defun gnus-summary-muttprint (&optional arg)
+ "Print the current article using Muttprint.
+If N is a positive number, save the N next articles.
+If N is a negative number, save the N previous articles.
+If N is nil and any articles have been marked with the process mark,
+save those articles instead."
+ (interactive "P")
+ (require 'gnus-art)
+ (let ((gnus-default-article-saver 'gnus-summary-pipe-to-muttprint))
+ (gnus-summary-save-article arg t)))
+