Step 1: Prepare Cardboard

Make Cardboard Mold Components

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To make this mold you will need to cut 7 rectangles out of cardboard.

2 - 5" x 0.5"
2 - 6" x 075"
2 - 1" x 0.75"
1 - 6" x 12"

 

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Glue the two 5” pieces together to form the central block.
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To prevent rubber from flowing inside the cardboard, seal the block with tape. Wrap the block with a strip of tape and fold down the edges.

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Smear hot glue on the top and bottom to hold the tape down. Seal the individual 6” wall pieces the same way.