Inspired by some existing other internal spool solutions for the elegoo centauri carbon I redesigned this version based on the fact that mine printer is placed inside an cabinet and outer side access is not possible.

Existing versions required to mount the spool stil from the outside, I swapped around the side panel and reused the existing spool holder bracket in the side frame of the printer and installed an modified spool holder for the inside of the printer.

still using the 7.5mm spacers of the existing solution for creating an bit more space for wider 1kg spools as well.

Using the key tool makes swapping spools an lot easier it can be done without but with the additional key its much more conveniant to unscrew the spool holder from the frame. Even when the bed is at about 50% spools can still be swapped this way so replacing materials during mid print remains possible.