You really have to use a printer that doesn't save cache of the printed files. They can be retrieved if you discard it.
Either that, flush the cache usually there is a way - even with the big office copying machines) or use a paperwallet that requires you to write a small code by hand which makes the rest useless. I dont remember off the top of my head which generator allowed that though.
I'm not as tech savy as you guys. I'm probably just gonna take my printer out back when I'm done with it and shoot it.
Paper wallets. Up until a couple months ago when I first discovered bitcoin, a paper wallet is an origami wallet. Lol.