Contempt
I would try not to be so combative. That is how the Court will see you too if you try to file contempt every 15-30 days. You are entitled to the partial payments, cash them.
Remember contempt is the "willful refusal" to follow a valid court order. If he is making partial payments he is trying. Work with him. Now if you know for sure that he has the means and just isn't paying, send him a letter (certified return receipt) that tells him to comply or face contempt. A letter is cheap, filing contempt isn't really cheap though if you win a Judge will probably award you legal fees.