Your trim DOESNT NEED TO BE DRY. I actually prefer moist trim vs dry for butter.
Take 4 sticks of butter melt it down in about a qt of water.
Grind all the bud, poor it in the butter water mix that is boiling and bring to a simmer... 30mins-45 of simmering then stir for 30 minutes straight.
Strain out the bud from the mixture, squeezing it to release any butter it had. (strain it into a bowl or something)
put the bowl in the fridge, let the butter sepearte and then remove it from the water..
ENJOY!