Prep your pieces of wood. Here, l've used bamboo (top) and sassafras.
Attach the pattern to one piece like normal, then stack the two pieces and securely tape them together using painter's tape. You can do up to three pieces at a time as long as the stack doesn't get too thick—stay at or below 3/4" (19mm).
Scroll the stack just like normal.
You get two coasters for the price of one!