I use the Mars Gizmo Drybox on a shelf attached to my Core One printer. This requires removing the spool holder. However, sometimes I use PLA spools without the Drybox, in which case I need the spool holder. Here's a solution for quickly attaching and detaching it.
The original screws from the spool holder can be reused.
Core One Shelf:
The author marked this model as their own original creation.