Step 2: Assemble Mold

Assemble Top Mold

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Glue the central block to a sheet of cardboard and trace the bottom with hot glue to prevent rubber from flowing underneath.
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Build the surrounding wall around the central block, with a 0.25” gap between the block and the corresponding side walls and a 0.5” gap between the short sides of the block and the end walls.
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To prevent the mold from leaking, seal all joints with hot glue. This should be done at least twice to ensure there are no leaks.

Assemble Bottom Mold

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Make the bottom mold by tracing a 7” by 1.5” block with hot glue. After the glue cools trace the box again to add a second layer of hot glue. Repeat until the hot glue is stacked about a 0.25” high.
Complete Mold

This is what the mold looks like when completed. (The paper is used in the fabrication of the actuator.)