I agree with the daily limit of paper, also show him how to save his documents so he can print them another day if he has reached his limit,

hey im always thinkin of what other people have already suggested rofl

good luck

 This isn't an immediate solution, but you might want to watch ebay or local office sales for a used laser printer.  I picked a five year old model up for my mom to use from my office, once, when they were upgrading at got it for really cheap.

It seems like a huge expense at first, but when you realize, over the long run, how much cheaper it is to buy toner than inkjet ink, it makes sense.

I would put a certain number of sheets of paper a day in his printer ( your discretion)..Once he's printed up that many sheets, he has finished printing for the day..This should allow the ink to last a bit longer..Then the next day give him the same amount of sheets again..This will also teach him to pick and choose what he prints because he will be used to having a certain amount of sheets of paper daily!!

Good luck and I hope he has fun!

Make sure that the default setting is for economy or draft print. The other option is that it doesn't automatically print, so that you can see what is about to be printed.