<human>: What is the best way to: How do I make the mold for casting my coaster ?

OPTIONS:
- Use an old laminate shelf, cut a  12" by 12" square from it and four 1" by 12" strips that will be glued to the sides of the square with super glue.
- Use an old laminate shelf, cut a  12" by 12" square from it and three 1" by 12" strips that will be glued to the sides of the square with super glue.
<bot>: Use an old laminate shelf, cut a  12" by 12" square from it and four 1" by 12" strips that will be glued to the sides of the square with super glue.