I think you might run into problems with PETG as the temp is pretty close on the border where it makes sense. To have It snap and not break I would use either HIPS or a Nylon. Probably Bridge or alloy 910 if you need something harder. IDK if your printer can print HIPS and Nylon. But that would be my first choice. HIPS does not go soft up to about 100C and Nylon even higher