I liked the eMaker style feet on their version of the Huxley so much that I had to hack together a matching version for a spool holder.
This thing operates on the same principle as other four bearing spool holders and is sized for Makerbot sized filament spools.
You will need the following:
2x 150mm M6 threaded rod
2x 125mm M6 threaded rod
4x 626ZZ ball bearing
16x M6 nut
20x M6 internal tooth lock washer
Assemble as shown, making sure to place a lock washer in between the inside of the foot and the bearing. Inside dimensions are approximately 76mm x 100mm between feet although this is not mission critical. I find it works especially well with 1.75mm filament to feed the filament from the bottom to stop filament unraveling.