The plastic will stretch as it lays over the objects when the frame touches the platen and creates a seal, the vacuum will be able to suck the plastic tightly over the pieces. When the Sintra is fully heated, turn on the vacuum cleaner and place the plastic over your objects onto the platen. (While writing this Instructable, I also learned that Sintra can be softened by submerging it in boiling water for 10 to 15 seconds, which seems like it would heat it more evenly). I clamped it inside the frame and heated it up with my heat gun for a few minutes until the whole piece was very flexible. I was using some Sintra plastic (expanded PVC) for my vacuum forming I had left over from a few years ago.
I grabbed some random objects and arranged them on the platen.
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