Aspies often have a lot of issues with bad handwriting. If I were you, I would get it looked at: if it's bad enough he may have dysgraphia. I used a laptop in my later years at school which was good, and given that computers are taking over the world, it seems rather pointless to stress over handwriting! I know laptops are expensive and he would be pretty young to have one, but if he's getting distressed about it or if his teacher is giving him a hard time, it's worth a thought... just get REALLY good insurance for it!
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...though fire may burn & flames envelop me, I will arise from the ashes...