This is how the vacume former worked the day I saw it. It was heated for about ten minutes. then a piece of thermoplastic was placed and heated for one minute. This caused the polymer particles that It is made up of moong chain monomers to get exited and become flexible and therefore remouldable. Then the now flexible thermoplastic is placed over the dye. The air is then pumped out of it so it fits easily around the dye. Then the thermoplastic is left to set. Sometimes certain designs are two big to fit inside a vacume former therefore they must be redesigned. It is essential that no parts of your design for your clock are not hanging over the edge of your first layer because when the thermoplastic comes on it will sag over the edges and ruin your whole clock.
here are some types of vacume formers
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