What is the best spacing for the rollers on malt mill? I'm sure that it is in the forum somewhere, but my search window is hidden behind the damn add at the top of the screen!
Some peoples systems can handle a crush as low as .035 which produces a lot of grain flour that can result in a stuck lauter if your system cannot handle it.
I also think it depends on what kind of mill you are using, 2,3 or 4 rollers, speed at which you mill and are you conditioning the malt. In addition to type of malt as mentioned already. You need to adjust to your particular set up.
.035 here with a schmidling malt mill. Moderate flour which is OK with batch sparging. I have never had a stuck sparge. Made a wit this past wkend, 10# wheat, no rice hulls, no problem at all. I use a 30" braid hose in my MLT.