Sorry I didn't reply to your question sooner. I've worked with one of my church customers that successfully used a Parallel Printer Sharing Device also referred to as a Parallel Auto Switch. They're pretty inexpensive. Here's a link to one that should work... http://www.cablesnmor.com/a885028.html. Please know that this solution is not fully supported by Fellowship Technologies as it has not been tested.
Blessings,
Mark Lindsley
Delivery Manager