How to cut plastic soda bottles?

Monkey Scout

New member
I'm cutting the bottoms off plastic bottles, which is easy enough. The part I'm having trouble with is cutting around the 5-petal-type design on the bottom because the plastic is considerably harder than the sides of the bottles. I have tried an x-acto but the plastic is too hard and I don't want to slip and slice myself. I bought a hot wire cutter for foam and that's leaving a melty bead. I don't want to sand or saw, I want the edges smooth. Suggestions?
 
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