The K1 Max is a great printer, however, it can be a pain getting to the filament spool. This is a modification of the spool holder by Roberto Corrêa and Igoravg98. It now mounts to the bottom of the printer making it a bit more stable.
https://www.printables.com/model/659505-k1-k1-max-spool-holder Roberto Corrêa
https://www.printables.com/model/673377-upgraded-side-spool-holder-k1k1-max-remix Igoravg98
The author remixed this model.
Moved the holder to the bottom of the printer. Also made it a bit taller. Added support to the center hole.