I really liked reading about the history of your homelab.
How do you like the 3d printed rack enclosure? Is it strong enough to hold the weight and heat from the server?
PETG starts to deform at ~75-85'c. The upper end of that should be fine, but the lower end.. certain things can get close to that temp. So if you've got good airflow, and nothing is passively getting to that temps you're probably good.
The best thing might be a design that has some core that holds the components.. print that in a higher temp filament, and print the outer shells in something a little more aesthetically pleasing.
Also.. remember to check if the filament you're using has any electrical conductivity.