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Step 8Build a Box Mold
Once the plaster part is prepared, measure the part. Add 1 inch total to the length and width and a couple of inches to the height to determine how large your box mold should be, as you'll need to leave 1/2 inch around all sides for mold walls.
For instance, if your part is 2 inches wide, 3 inches long, and 8 inches tall, you'll need to build a box mold with interior dimensions of about 3 inches wide by 4 inches long by about 10 inches tall (1/2 inch, plus some extra to keep everything inside).
To build box mold, cut a mold base plus four walls to the appropriate dimensions out of plywood, MDF, or any other wood you have available. Simply screw the walls together to form a square with basic butt joints and screw the box to the base, so it's enclosed on 5 sides.
For instance, if your part is 2 inches wide, 3 inches long, and 8 inches tall, you'll need to build a box mold with interior dimensions of about 3 inches wide by 4 inches long by about 10 inches tall (1/2 inch, plus some extra to keep everything inside).
To build box mold, cut a mold base plus four walls to the appropriate dimensions out of plywood, MDF, or any other wood you have available. Simply screw the walls together to form a square with basic butt joints and screw the box to the base, so it's enclosed on 5 sides.
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