Many years ago, I was the child in this scenario. The divorce was acrimonious, lots of issues between the parents. We lived a long way apart, like over 4000kms. I saw very little of my father. A cheque would arrive for my birthday each year (thanks to his secretary who purchased the card).
Amazingly, mum never said anything really negative to me about dad, but of course I picked up the vibe. Felt loyalty to mum etc, but I was a child.
One of the good things that I remember, when I went to uni, he didn't say he was proud of me, but he did come through with a decent weekly contribution direct to me (not through mum) and it really made a difference and I really appreciated it.
If you want to keep the door open for the future, for a time when they can more reflectively look back at their relationship with you, I'd be continuing to contribute now.
Have a look at the university boards here. I'd say somewhere between 80-100 a week would seem reasonable. Most parents need to top up loans, pay for phones and sports clubs, rail tickets home etc, all sorts of little extras.
Also, think about their course, if it's something like medicine, or something with a lot of contact hours, then this will affect their ability to work during the semester too.
I think it's good that the other parent has already said to send it straight to your child, at least you know where it's going.