If they show an interest in printing at that age, great, but if not, don't fret Some kids of that age are just more naturally interested in it than others and I don't think it's due to anything that others did to encourage them. Once they are in school they learn so fast too.

Having said that when my son was younger I bought this http://www.crayola.com/browse-produc...ty-center.aspx which he mainly used for scribbling (haha) but I now use it in my daycare as a fun learning tool. I love that it's dry erase and the cards are great.