I have not been that successfull with stack cutting. Im not sure if its the blades im using or my saw dont like cutting 2 x 6 mm. Seems to take longer to cut. Saying that the cat is being done on 3mm so I could of tried 2 x 3mm that would of most likely cut ok as I normally work in 6mm any way. I use 22pti blades most of the time