The author remixed this model.
Chain Cover for "Ender 3 Case - Right Case SKR 3 EZ W/Chain"
Cover for “Case” → “Chain”
https://www.printables.com/model/538248-ender-3-case-right
Remix from: https://www.thingiverse.com/thing:2920060 → “cableChain_bedCornerCover_v2.stl”