I cut around day 57. There are many really bad experiences posted on this forum about people who cut early. SnakebytesTV has a new cutting video and I believe he cuts around day 57 as well. Every day you cut early, you expose a moist warm environment to allow all kinds of gunk to enter. Patience is a real virtue and the greatest trait needed in ball python breeding.
Here is a link to the Snake Byte TV video: http://www.youtube.com/watch?v=sL3mc3-e8VI