If you have a few extra build plates for your Elegoo Centauri Carbon, one of the easiest upgrades you can print is a Centauri Carbon build plate holder.
Instead of stacking your extra plates on a shelf or leaning them against the printer, a printed holder keeps them separated and makes it easy to grab whichever plate you want.
My Favorite Centauri Carbon Build Plate Holder
One of the better designs I've found is the Centauri Carbon Build Plate Holder Stand. It's designed specifically around the Centauri Carbon's 256 x 256mm build plates.
Even better, it's a print-in-place design with no supports needed, so this is a really easy print.
Download the Centauri Carbon Build Plate Holder STL
There's also a really cool option that mounts directly to the side of the Centauri Carbon and holds three spare build plates plus the top glass. If you want everything attached to the printer instead of sitting on your desk, I'd probably go with this one.
Download the Build Plate + Glass Holder
Is It Worth Printing?
Definitely. If you already own a 3D printer, I don't see much reason to buy a build plate holder when you can just print one.
It's a simple Centauri Carbon upgrade, doesn't use a crazy amount of filament, and gives you somewhere to keep all those extra build plates you're inevitably going to end up buying.