Edit to add the following to your htaccess file found in root folder.
RewriteCond %{HTTP_HOST} ^www\.printingready\.com$
RewriteRule ^(.*)$ http://printingready.com/$1 [L,R=301]
RewriteCond %{HTTP_HOST} !^www\.printingready\.com
RewriteRule (.*) http://www.printingready.com/$1 [R=301,L]
