Some news from Slush Pool that might interest folks with Kncminers
"In order to celebrate the 3rd birthday of Slush's Pool, all rewards mined on 18th December 2013 (UTC time) will be paid out with a 0% fee to the miners. Good luck!"
I don't know their normal fee, but this is sad. We are talking about 1-3% so from what a Jupiter mines in one day it will be around 3-7$. They should have one week or so. One day is just sad.