I keep my printer up on a high enclosed shelf, out of the way of the kitties. But my cat Bear, being a jumper, could probably easily reach it if he thought it was fun to play with. So that may not work for you. I have read, however, that cats do not like the feeling of plastic wrap or aluminum/tin foil under their feet. When I tested this with my cat in order to solve a problem with litter box accidents, he was cautious about the plastic wrap but did walk over it, and completely avoided the foil. (he had no problems with parchment paper, btw.) So depending on your cats, taping sheets of foil or saran wrap on the surface around your printer might keep them away from it. Also, cats have an incredibly strong sense of smell and they don't like the smell of vinegar, so soaking a towel with the stuff and keeping it near your printer might create an effective cat repellent. Many humans don't like the smell of vinegar either, so either go with apple cider vinegar (which doesn't smell as strong) or let the towel dry so it isn't as vinegary-smelling. The cats should still be able to detect it, and may avoid the printer. Good luck with the little feline marauders!