my handwriting was absolutely terrible, print or cursive, until the 5th grade. it still isn't the best in my first year of college, but it does get better over time.
one big suggestion i have, though, is let him discover his own handwriting style; whether it's printed block letters, general cursive, calligraphy or a blend, he will find what works for him. i didn't figure out just what worked for me until at least the 8th grade, but besides my writing going from semi-legible to totally legible, once i found by style, it hasn't changed
_________________
Dance like no one is watching. Sing like no one is listening. Love like you've never been hurt and live like it's heaven on Earth. -Mark Twain
If life gives you lemons, make grape juice, sit back and watch the world wonder how you did it.