Hi Beatnik, our son had a similar issue with illegible handwriting K-3. He's now in fourth grade (and is still a terrible speller). For awhile it was difficult for the experts to tell how much of the illegibility might be OT vs other factors; we worked to get the right tools in place step by step. I had to do a lot of advocacy. He was in a gifted program last year that used voice-to-text; apps for that vary a lot and we had to experiment to get the right one. This year we've moved to a new state and had to start all over. He's had very appropriate writing assignments to do by hand, no spelling tests, and to my surprise, his handwriting has suddenly become legible. Still not quick, and he struggles to get out all the ideas swirling around inside - for that, voice or now hand typing is still faster. But much more proficiency with handwriting over time.