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This is a cheap easy trick that will help you sand the rough edges off of your projects. This works with interior and exterior cuts. If you have a pinned scroll saw you can do the same thing by gluing the sand paper around a blade. If you want to do it by hand you can also cut small strips of sand paper and then glue that to popsicle sticks to get into interior cuts. If you find that your sand paper tears too easily, there are commercial sanding blades that do the same thing.