This bracket makes it possible to fit a low friction bearing spool holder to the original V400 spool holder. The bracket fits by sliding it over the original after removing the horizontal part. It is not necessary to modify the original spool holder.

I used this model: https://www.printables.com/model/353343-two-bearing-spool-holder

to complete my setup, but others may of course be used. An 8mm bolt fits the hole.

Print upside down. No supports should be needed.