If you're looking for the best Centauri Carbon door hinge upgrade, I'd go with the 270-degree hinge mod. It's a simple 3D printed upgrade, but it fixes one of the more annoying things about the stock Centauri Carbon door.
Why Upgrade the Centauri Carbon Door Hinge?
The stock glass door doesn't open very far, which means it's constantly sticking out in front of the printer when you're trying to work inside it.
The 270-degree hinge lets the door swing much farther around toward the side of the printer. This gets the glass door out of your way and makes accessing the build plate and inside of the printer a lot easier.
It's also become one of the more popular Centauri Carbon mods, with the MagicShrimp 270-degree hinge showing up in community upgrade lists and Centauri Carbon mod videos.
Best Centauri Carbon 270 Degree Hinge
The one I'd start with is the MagicShrimp 270 Degree Hinge designed specifically for the original Elegoo Centauri Carbon.
Checkout Door hinges on Printables dot com
It's a relatively easy print and gives you a surprisingly big quality-of-life improvement.
If you're printing mostly PLA and PETG and regularly leave the door open anyway, I think this is one of the best Centauri Carbon upgrades you can print. It keeps that big glass door out of the way while still letting you close the printer back up when you're printing ABS, ASA, or other materials that benefit from the enclosure.