25mm Splice Extension for Universal Spool Stand by Embrace Making. You can find the Spool Stand here:

► https://embracemaking.com/products/universal-top-mount-spool-stand

You can find more application information here:

► https://embracemaking.com/blogs/resources/universal-top-mount-spool-stand-accessories-and-adapters

The extension is useful for taller machine applications such as Creality K1 MAX. 

Assembly video of the spool stand:

Print the splice extension with the large flat face down on the print bed. Support is required under the triangular mount for the side cutters.

This mounting solution has been confirmed to fit:

Creality K1 Max