Help choosing a heat resistant filament

I need to print a frame to mount a motherboard and PSU on in a custom build I’m doing. I have an ender 3 s1 pro so I have the ability to switch to different filaments. I’m mostly worried about the frame melting due to it being inside a hot case, so I was going to go with either ABS or PETG. Are there any other filaments I should look at? Is there a recommended infill density?