It sounds like you feel they violated the IEP because your son is allowed under the IEP to email his assignments, apparently instead of handwriting them out. The teacher's printer is broken and she asked him to print them out and give them to her, which he didn't.
That doesn't sound like a huge violation of the IEP. What if he had not emailed the assignment? It would be the same result. Does it say in the IEP that they are supposed to contact you if he doesn't turn in assignments? I think you can legitimately ask to have the printer in place. That also isn't expensive anyway.
The vocab tests sound like that is something your son isn't good at, which is a bummer, but that would presumably not be in the IEP. Maybe you should just meet with the teacher and see how to help your son do better.
I agree with Master of none- you need to define what exactly you want.
