Will try and keep it brief!
2 primary aged DC, ex doesn't pay maintenance.
He has them 3 nights a week, sometimes over the week and sometimes over the weekend so that we both get some weekends and some week day drudge!
He has always paid half of everything, clothes, trips, uniform etc... And will often buy things like shoes and clothes when they are with him anyway.
We both have good careers and work full time.
He always does school runs on his days and helps with mine too if needed (and vice versa).
We are very flexible with each other. He will always jump at the chance to have them more too so say if I have plans one night he will happily have them 4 nights or more, whatever is needed.
Because of this I have honestly never thought to claim any maintenance off him, I don't feel it would be fair for one extra night (and he does sometimes have them that extra night too).
Someone close to me has said they would still claim it in this situation. I'm not going to as I am happy with our set up and think we work well together but interested what other people would think is fair in this situation, I honestly don't feel it would be fair to imo.