Growing up, my handwriting was excellent, both printed and cursive. This was during the sixties, before computers or even electric typewriters. Handwriting was an actual separate subject, and I always excelled at it. I've even done a little calligraphy (but not at anything like a professional level).
At some point in my 20s, I developed a combination of cursive and printed handwriting, which I've used ever since. I don't write a lot anymore since I have a laptop, and when I do, my hand gets cramped easily. I also find I don't have the patience I once had for handwriting, so it comes out kind of average. Having a computer has increased my expectation of doing things speedily, and it's hard to be speedy and have good handwriting.
Even though I'm an aspie, I've never had poor motor skills--played all kinds of sports requiring good hand-eye coordination, good at handwriting, etc. These days, however, I'm a complete klutz, and bang into things all the time. I have bruises on my legs that I don't even know where they came from, that's how often I run into things.