This is an adapter from the standard prusa enclosure spool mount to accept a standard filler spool holder.
The author remixed this model.
I trimmed and rotated the clip portion from the prusa spool holder to make it fit, then trimmed one of the filler stands to fit then joined them.
I printed in PLA without issue so far, but PETG or ABS may be more appropriate.
Supports are needed for the enclosure holder side.