Polyester fabric...is it safe to cut?

Glowforging polyester it is not going to destroy your GF through producing acids. I would glowforge it as long as my ventilation is working right. Whatever bad stuff it produces isn’t produced in great quantities and is mostly just going to go out the window. Polyester might very well produce less bad stuff than wood does. But I’m not a chemist and your assumption of risk may vary from mine.

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