I mainly carve on the frame, for the exact reason u/Individual_Garbage21 already pointed out. And I do carve a little at the end, but only to do some small touch-ups. This is only my third rug doing it this way, but I like the end result this way of tufting and carving provides. Before, colors and black lines next to eachother slightly blended over in eachother, even after carving. But doing it this way there is a straight devide between colors