I don't think it will work for school but washable fat markers make the clearest straightest letters automatically. That's where we started. Now we're on to pencils and pens. Handwriting without tears book recommends and sells a little bag of golf pencils, saying they're more the right size for children. I just went and broke a few of our pencils in half and sharpened the nubs and told the boy those were his pencils. He can already get any of the pencils, pens, markers, crayons, paints or whatever, just those are 'specially his.
