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When cutting crown molding, use setup blocks (Image 1) to help figure out how to orient the molding and the blade on the miter saw to ensure the corners come out right.
Make two sets of setup blocks, one for outside corners and one for inside corners (Image 2). Each set of blocks has a left and a right side, so be sure to label each piece.
The setup blocks each have an end board with a rabbet cut into the bottom. The rabbet fits over the lip of the saw table. When the setup block is on the saw table, the rabbet ensures the block will fit only one way.