I had some extra PVC pipe and fittings so I threw together this super basic spool holder mount.
I used 3/4'' PVC pipe, with a T connector and two endcaps to stop the filament from sliding off. The two top pieces of PVC were cut to about 160mm, and the center piece was cut to about 200mm, but any size will work.
The pipe then just slides into the plastic piece, which mounts to the table with 4 #12 ¾ inch screws.
The author marked this model as their own original creation.