/diy/ - Do It Yourself

So I'm working on computer case mods for my Fractal Design Node 202. Of course since it's a Mini ITX case the mods are all to improve thermals. I've been out of the 3d printing game for a bit (2017). I'm using a CR-10 now. I've got some filament specific questions and want some overhang printing advice.

My plan is to mount 2x120mm fans to the gpu vent externally with a printed bracket. I will also be using the existing fan mounts inside the case to mount a duct to ensure mostly outside air is being drawn in for cooling. I cannot mount the fans internally due to the size of my graphics card.

I want to use PLA+ for the mods. I'm expecting temperatures in the case to ramp around 55 degrees Celsius max during heavy loads. Do you guys think a thin walled shroud (~3mm) would fail over time? Would PETG perform better?

I also would like to print without supports. Do you think this overhang would be okay with minimal deformation? I am willing to clean a print a bit but hate using supports unless they are absolutely necessary.