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A wood saw works pretty good with all plastics. Then you file very cleanly with the smoothest file you can find, clean everything well and then the most dangerous step. You heat up the edge with a blowtorch in a continuous movement, don't stop at the same spot. It's dangerous work, use adquate protection, mask and glasses and have a fire extinguisher next to you. Try it on a piece of plexy first, and then the offcut you took out.
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