Joybell

If you only want a record copy for your own use, and don't mind a little acknowledgement at the bottom of each page, download FinePrint from www.fineprint.com

It's a general purpose print utility which sits between Windows and the printer (it appears as another printer). One of its options is double-sided printing on any printer which can physically do it. My old HP Laserjet 4L won't - it heats the paper too much on the first side, and the second side jams.

It's 100% reliable - I've been using it through all it's versions for more than 10 years. If it works for you and you can't stand the banner, purchasing removes it.

Phil