Bruce
Herd Master
Ran into that using a jigsaw on corrugated plastic panels. No chipping or cracking with that stuff though, it is pretty soft plastic.or the kerf get hot and melt back together behind the blade.
I've not done anything with polycarbonate but acrylic, yep it loves to crack and chip. Definitely want to have the section being cut VERY stable so it can't bounce while being cut.