I think the trick is a combination of good pressing, a little starch or best press, careful stacking, a nice sharp rotary blade and a good and accurate ruler (Creative Grids is just one of the brands I really like right now). I usually don't stack more than 3 layers at a time, but know ladies who bravely stack 4. I find even with a new blade you can get some skipping and wonky edges with 4 layers. ;) Good luck to you!