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It won't work in a microwave because of the way a microwave works. The oven works by heating the whole inside of the oven to an even temperature, which will heat all the components of the plastic relatively evenly and cause it to revert to its original shape (shrink) before it was heat formed the first time. Microwaves work by causing the water molecules to gain energy essentially. It doesn't heat it evenly and won't cause the plastic to shrink at all.
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