If you've tried the stock filament spool holder for your Elegoo Centauri Carbon, you'll know that it's functional, but could be a lot better.  Well, here's better!  This filament spool holder will replace your stock holder with a better rolling spool holder to make everything run that much smoother.  An added perk is being able to add in a little touch of your color of choice, as well, to further customize your machine.  This print includes the spool holder mount, which clicks into the factory location.  From there you print one of two of the spool sleeve options.  One can be used as-is and will slide onto the mount to give an overall easy replacement that will improve smoothness for most all spools, including those pesky cardboard spools that always wanna cause extra friction.  The other option for spool sleeves will give you one with locations to add 15x24x5mm bearings for an effortless smoothness.  This one is amazing for things like TPU that really benefit from getting rid of as much friction as possible in the unspooling process. Either sleeve option is a big improvement on the original spool holder.

Print at least the spool mount in PETG to give it the extra rigidness it needs to hold the weight of the spool without drooping over time.  The spool can be printed from PLA or another material if you choose.  And have some fun with the colors! :)

To assemble, click the mount into the factory mount location on your Centauri Carbon, slide on the sleeve of your choice, and then push on the end cap.  That's it!