Tablesaw Coroplast
I just use a plain old carpet knife (box cutter, utility knife) to cut through the inside layer of the cut, then bend on it. If you read through the tread about my SedanKamm, I basically say that I use a straight edge to cut along, then use the straight edge to bend along. It works well.
A table saw could be used easily enough, but coroplast is so light weight, that you will find it's really overkill.
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