My first one was fantastic.
My second didn't create any curds. ( I didn't add any extra milk)
My third, I added a quart of milk and I had curds but, seeing that it was 11:30 at night I tried to hurry it.
ADVICE:
Don't squeeze the muslin to get rid of the whey. Let it hang for an hour like it's supposed to. Otherwise you get something like dry feta.
I'm going to just make whole milk Ricotta next time I need it. Seems the other way (no pun intended) is a lot of work, but the quantity isn't there.
JMHO
Brian