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The cone form is basically 3 layers of plywood with a 7 inch circle cut out of the first two layers. The acrylic sheet is then placed between these two layers and a round object underneath (I used an old salsa bottle)
After heating in the oven at around 310 degrees for 10 minutes I used wing nuts to tighten down the top two boards to the bottom and did one turn on each in a crisscross pattern so it would come out evenly. Had to reheat a couple times because turning the wing nuts took a while but it came out ok in the end.
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