This is a large print in place bushing with races. The assembly consists of a base, spool and cap. The base and spool should be printed together in a vertical orientation as pictured. The spool will be trapped on the base by the races. I had to use support blockers on the body of the spool / base to make sure no supports were generated inside the bushing contact area. There is a build in groove for the Z-seam that you will want to align your seam to.
I included the cap. It is the original @Elphwrkz design with no modifications.
PLA works, but I think PETG offers a bit less friction.
I am using this on a k1, but it should work on any printer that uses the stock Creality bayonet mount spool holder bracket.
To read more Indepth directions go to the original model. Qidi X-Max (X-Plus) Internal Spool Holder by Elphwrkz | Download free STL model | Printables.com.
The author remixed this model.
Added a Creality Bayonet mount instead of the bolt in the original design and integrated the installation key.